The Swift Package Index logo.Swift Package Index

Track the adoption of Swift 6 strict concurrency checks for data race safety. How many packages are Ready for Swift 6?

Build Information

Failed to build ColorPerception, reference main (d8177c), with Swift 6.1 for macOS (Xcode) using Xcode 16.3 on 30 Apr 2025 15:39:06 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme ColorPerception -destination platform=macOS,arch=arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/gregmturek/color-perception.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/gregmturek/color-perception
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at d8177ca Update README.md
Cloned https://github.com/gregmturek/color-perception.git
Revision (git rev-parse @):
d8177cabc4d2325d17cdd22ffc224f64c563129e
SUCCESS checkout https://github.com/gregmturek/color-perception.git at main
========================================
Build
========================================
Selected platform:         macosXcodebuild
Swift version:             6.1
Building package at path:  $PWD
https://github.com/gregmturek/color-perception.git
https://github.com/gregmturek/color-perception.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ColorPerception",
  "name" : "ColorPerception",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "tvos",
      "version" : "15.0"
    },
    {
      "name" : "watchos",
      "version" : "8.0"
    },
    {
      "name" : "visionos",
      "version" : "1.0"
    }
  ],
  "products" : [
    {
      "name" : "ColorPerception",
      "targets" : [
        "ColorPerception"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ColorPerceptionTests",
      "module_type" : "SwiftTarget",
      "name" : "ColorPerceptionTests",
      "path" : "Tests/ColorPerceptionTests",
      "sources" : [
        "ColorExtensionTests.swift",
        "ColorPerceptionUtilsTests.swift",
        "DefaultContrastPairCacheTests.swift",
        "TestHelpers.swift",
        "UIColorExtensionTests.swift"
      ],
      "target_dependencies" : [
        "ColorPerception"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ColorPerception",
      "module_type" : "SwiftTarget",
      "name" : "ColorPerception",
      "path" : "Sources/ColorPerception",
      "product_memberships" : [
        "ColorPerception"
      ],
      "sources" : [
        "ColorExtension.swift",
        "ColorPerceptionUtils.swift",
        "ContrastPairCache.swift",
        "DefaultContrastPairCache.swift",
        "PerceptualColor.swift",
        "UIColorExtension.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "6.0"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Resolve Package Graph
Resolved source packages:
  ColorPerception: /Users/admin/builder/spi-builder-workspace
resolved source packages: ColorPerception
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ColorPerception",
  "name" : "ColorPerception",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "tvos",
      "version" : "15.0"
    },
    {
      "name" : "watchos",
      "version" : "8.0"
    },
    {
      "name" : "visionos",
      "version" : "1.0"
    }
  ],
  "products" : [
    {
      "name" : "ColorPerception",
      "targets" : [
        "ColorPerception"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ColorPerceptionTests",
      "module_type" : "SwiftTarget",
      "name" : "ColorPerceptionTests",
      "path" : "Tests/ColorPerceptionTests",
      "sources" : [
        "ColorExtensionTests.swift",
        "ColorPerceptionUtilsTests.swift",
        "DefaultContrastPairCacheTests.swift",
        "TestHelpers.swift",
        "UIColorExtensionTests.swift"
      ],
      "target_dependencies" : [
        "ColorPerception"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ColorPerception",
      "module_type" : "SwiftTarget",
      "name" : "ColorPerception",
      "path" : "Sources/ColorPerception",
      "product_memberships" : [
        "ColorPerception"
      ],
      "sources" : [
        "ColorExtension.swift",
        "ColorPerceptionUtils.swift",
        "ContrastPairCache.swift",
        "DefaultContrastPairCache.swift",
        "PerceptualColor.swift",
        "UIColorExtension.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "6.0"
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "ColorPerception"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme ColorPerception -destination platform=macOS,arch=arm64 OTHER_SWIFT_FLAGS=-stats-output-dir .stats
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme ColorPerception -destination platform=macOS,arch=arm64 "OTHER_SWIFT_FLAGS=-stats-output-dir .stats"
Build settings from command line:
    OTHER_SWIFT_FLAGS = -stats-output-dir .stats
Resolve Package Graph
Resolved source packages:
  ColorPerception: /Users/admin/builder/spi-builder-workspace
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (2 targets)
    Target 'ColorPerception' in project 'ColorPerception'
        ➜ Explicit dependency on target 'ColorPerception' in project 'ColorPerception'
    Target 'ColorPerception' in project 'ColorPerception' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
Build description signature: 3791cc1008c291e150eb3d85fab86eac
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/3791cc1008c291e150eb3d85fab86eac.xcbuilddata
CreateBuildDirectory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    builtin-create-build-directory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products
ClangStatCache /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang-stat-cache /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk /Users/admin/builder/spi-builder-workspace/.derivedData/SDKStatCaches.noindex/macosx15.4-24E241-8287b8f5db97e746a1562fbca0c9d29b.sdkstatcache
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang-stat-cache /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -o /Users/admin/builder/spi-builder-workspace/.derivedData/SDKStatCaches.noindex/macosx15.4-24E241-8287b8f5db97e746a1562fbca0c9d29b.sdkstatcache
CreateBuildDirectory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    builtin-create-build-directory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex
CreateBuildDirectory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/EagerLinkingTBDs/Debug
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    builtin-create-build-directory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/EagerLinkingTBDs/Debug
CreateBuildDirectory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    builtin-create-build-directory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug
CreateBuildDirectory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug/PackageFrameworks
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    builtin-create-build-directory /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug/PackageFrameworks
WriteAuxiliaryFile /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/ColorPerception.modulemap (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    write-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/ColorPerception.modulemap
WriteAuxiliaryFile /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/ColorPerception.DependencyStaticMetadataFileList (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    write-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/ColorPerception.DependencyStaticMetadataFileList
WriteAuxiliaryFile /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/ColorPerception.DependencyMetadataFileList (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    write-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/ColorPerception.DependencyMetadataFileList
WriteAuxiliaryFile /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.SwiftFileList (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    write-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.SwiftFileList
WriteAuxiliaryFile /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-OutputFileMap.json (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    write-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-OutputFileMap.json
WriteAuxiliaryFile /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.SwiftConstValuesFileList (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    write-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.SwiftConstValuesFileList
WriteAuxiliaryFile /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.LinkFileList (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    write-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.LinkFileList
WriteAuxiliaryFile /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception_const_extract_protocols.json (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    write-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception_const_extract_protocols.json
Copy /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/GeneratedModuleMaps/ColorPerception.modulemap /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/ColorPerception.modulemap (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace
    builtin-copy -exclude .DS_Store -exclude CVS -exclude .svn -exclude .git -exclude .hg -resolve-src-symlinks /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/ColorPerception.modulemap /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/GeneratedModuleMaps
SwiftDriver ColorPerception normal arm64 com.apple.xcode.tools.swift.compiler (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    builtin-SwiftDriver -- /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc -module-name ColorPerception -Onone -enforce-exclusivity\=checked @/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.SwiftFileList -DSWIFT_PACKAGE -DDEBUG -stats-output-dir .stats -plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins/testing -enable-experimental-feature DebugDescriptionMacro -sdk /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -target arm64-apple-macos10.13 -g -module-cache-path /Users/admin/builder/spi-builder-workspace/.derivedData/ModuleCache.noindex -Xfrontend -serialize-debugging-options -profile-coverage-mapping -profile-generate -enable-testing -index-store-path /Users/admin/builder/spi-builder-workspace/.derivedData/Index.noindex/DataStore -swift-version 6 -I /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug -I /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug -F /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -c -j10 -enable-batch-mode -incremental -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.derivedData/SDKStatCaches.noindex/macosx15.4-24E241-8287b8f5db97e746a1562fbca0c9d29b.sdkstatcache -output-file-map /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-OutputFileMap.json -use-frontend-parseable-output -save-temps -no-color-diagnostics -serialize-diagnostics -emit-dependencies -emit-module -emit-module-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.swiftmodule -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.derivedData/ModuleCache.noindex/Session.modulevalidation -package-name spi_builder_workspace -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/swift-overrides.hmap -emit-const-values -Xfrontend -const-gather-protocols-file -Xfrontend /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception_const_extract_protocols.json -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -emit-objc-header -emit-objc-header-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-Swift.h -working-directory /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode -experimental-emit-module-separately -disable-cmo
SwiftCompile normal arm64 Compiling\ ContrastPairCache.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ContrastPairCache.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ContrastPairCache.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ ColorExtension.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorExtension.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorExtension.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ DefaultContrastPairCache.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/DefaultContrastPairCache.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/DefaultContrastPairCache.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ ColorPerceptionUtils.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorPerceptionUtils.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorPerceptionUtils.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ UIColorExtension.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/UIColorExtension.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/UIColorExtension.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ PerceptualColor.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/PerceptualColor.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/PerceptualColor.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftEmitModule normal arm64 Emitting\ module\ for\ ColorPerception (in target 'ColorPerception' from project 'ColorPerception')
Failed frontend command:
/Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorExtension.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorPerceptionUtils.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ContrastPairCache.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/DefaultContrastPairCache.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/PerceptualColor.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/UIColorExtension.swift -target arm64-apple-macos10.13 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -I /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug -I /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug -F /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -no-color-diagnostics -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=4 -module-cache-path /Users/admin/builder/spi-builder-workspace/.derivedData/ModuleCache.noindex -profile-generate -profile-coverage-mapping -swift-version 6 -enforce-exclusivity\=checked -stats-output-dir /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode/.stats -Onone -D SWIFT_PACKAGE -D DEBUG -serialize-debugging-options -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception_const_extract_protocols.json -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins/testing -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.derivedData/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode -resource-dir /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -enable-anonymous-context-mangled-names -file-compilation-dir /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.derivedData/SDKStatCaches.noindex/macosx15.4-24E241-8287b8f5db97e746a1562fbca0c9d29b.sdkstatcache -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/swift-overrides.hmap -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -module-name ColorPerception -package-name spi_builder_workspace -frontend-parseable-output -disable-clang-spi -target-sdk-version 15.4 -target-sdk-name macosx15.4 -external-plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins\#/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins\#/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -in-process-plugin-server-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/local/lib/swift/host/plugins -emit-module-doc-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.swiftdoc -emit-module-source-info-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.swiftsourceinfo -emit-objc-header-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-Swift.h -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-master-emit-module.dia -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-master-emit-module.d -o /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.swiftmodule -emit-abi-descriptor-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.abi.json
EmitSwiftModule normal arm64 (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

/Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/UIColorExtension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:macOS, arch:arm64, id:eb0648e405ee9e8a7fda95f836403a5cb6c6f572, name:My Mac }
{ platform:macOS, arch:arm64, variant:Mac Catalyst, id:eb0648e405ee9e8a7fda95f836403a5cb6c6f572, name:My Mac }
{ platform:macOS, arch:arm64, variant:DriverKit, id:eb0648e405ee9e8a7fda95f836403a5cb6c6f572, name:My Mac }
{ platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:eb0648e405ee9e8a7fda95f836403a5cb6c6f572, name:My Mac }
** BUILD FAILED **
The following build commands failed:
	SwiftEmitModule normal arm64 Emitting\ module\ for\ ColorPerception (in target 'ColorPerception' from project 'ColorPerception')
	EmitSwiftModule normal arm64 (in target 'ColorPerception' from project 'ColorPerception')
	Building workspace spi-builder-workspace with scheme ColorPerception
(3 failures)
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Resolved source packages:
  ColorPerception: /Users/admin/builder/spi-builder-workspace
resolved source packages: ColorPerception
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ColorPerception",
  "name" : "ColorPerception",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "tvos",
      "version" : "15.0"
    },
    {
      "name" : "watchos",
      "version" : "8.0"
    },
    {
      "name" : "visionos",
      "version" : "1.0"
    }
  ],
  "products" : [
    {
      "name" : "ColorPerception",
      "targets" : [
        "ColorPerception"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ColorPerceptionTests",
      "module_type" : "SwiftTarget",
      "name" : "ColorPerceptionTests",
      "path" : "Tests/ColorPerceptionTests",
      "sources" : [
        "ColorExtensionTests.swift",
        "ColorPerceptionUtilsTests.swift",
        "DefaultContrastPairCacheTests.swift",
        "TestHelpers.swift",
        "UIColorExtensionTests.swift"
      ],
      "target_dependencies" : [
        "ColorPerception"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ColorPerception",
      "module_type" : "SwiftTarget",
      "name" : "ColorPerception",
      "path" : "Sources/ColorPerception",
      "product_memberships" : [
        "ColorPerception"
      ],
      "sources" : [
        "ColorExtension.swift",
        "ColorPerceptionUtils.swift",
        "ContrastPairCache.swift",
        "DefaultContrastPairCache.swift",
        "PerceptualColor.swift",
        "UIColorExtension.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "6.0"
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "ColorPerception"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme ColorPerception -destination platform=macOS,arch=arm64
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme ColorPerception -destination platform=macOS,arch=arm64
Resolve Package Graph
Resolved source packages:
  ColorPerception: /Users/admin/builder/spi-builder-workspace
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (2 targets)
    Target 'ColorPerception' in project 'ColorPerception'
        ➜ Explicit dependency on target 'ColorPerception' in project 'ColorPerception'
    Target 'ColorPerception' in project 'ColorPerception' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
Build description signature: 445507a160c47c0ed0854242f43522fa
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/445507a160c47c0ed0854242f43522fa.xcbuilddata
ClangStatCache /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang-stat-cache /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk /Users/admin/builder/spi-builder-workspace/.derivedData/SDKStatCaches.noindex/macosx15.4-24E241-8287b8f5db97e746a1562fbca0c9d29b.sdkstatcache
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang-stat-cache /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -o /Users/admin/builder/spi-builder-workspace/.derivedData/SDKStatCaches.noindex/macosx15.4-24E241-8287b8f5db97e746a1562fbca0c9d29b.sdkstatcache
SwiftDriver ColorPerception normal arm64 com.apple.xcode.tools.swift.compiler (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode
    builtin-SwiftDriver -- /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc -module-name ColorPerception -Onone -enforce-exclusivity\=checked @/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.SwiftFileList -DSWIFT_PACKAGE -DDEBUG -DXcode -plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins/testing -enable-experimental-feature DebugDescriptionMacro -sdk /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -target arm64-apple-macos10.13 -g -module-cache-path /Users/admin/builder/spi-builder-workspace/.derivedData/ModuleCache.noindex -Xfrontend -serialize-debugging-options -profile-coverage-mapping -profile-generate -enable-testing -index-store-path /Users/admin/builder/spi-builder-workspace/.derivedData/Index.noindex/DataStore -swift-version 6 -I /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug -I /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug -F /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -c -j10 -enable-batch-mode -incremental -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.derivedData/SDKStatCaches.noindex/macosx15.4-24E241-8287b8f5db97e746a1562fbca0c9d29b.sdkstatcache -output-file-map /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-OutputFileMap.json -use-frontend-parseable-output -save-temps -no-color-diagnostics -serialize-diagnostics -emit-dependencies -emit-module -emit-module-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.swiftmodule -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.derivedData/ModuleCache.noindex/Session.modulevalidation -package-name spi_builder_workspace -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/swift-overrides.hmap -emit-const-values -Xfrontend -const-gather-protocols-file -Xfrontend /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception_const_extract_protocols.json -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -emit-objc-header -emit-objc-header-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-Swift.h -working-directory /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode -experimental-emit-module-separately -disable-cmo
SwiftCompile normal arm64 Compiling\ ColorPerceptionUtils.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorPerceptionUtils.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorPerceptionUtils.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ ColorExtension.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorExtension.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorExtension.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ ContrastPairCache.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ContrastPairCache.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ContrastPairCache.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ PerceptualColor.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/PerceptualColor.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/PerceptualColor.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftCompile normal arm64 Compiling\ UIColorExtension.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/UIColorExtension.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/UIColorExtension.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

SwiftEmitModule normal arm64 Emitting\ module\ for\ ColorPerception (in target 'ColorPerception' from project 'ColorPerception')
Failed frontend command:
/Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorExtension.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ColorPerceptionUtils.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/ContrastPairCache.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/DefaultContrastPairCache.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/PerceptualColor.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/UIColorExtension.swift -target arm64-apple-macos10.13 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -I /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug -I /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug -F /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -no-color-diagnostics -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=4 -module-cache-path /Users/admin/builder/spi-builder-workspace/.derivedData/ModuleCache.noindex -profile-generate -profile-coverage-mapping -swift-version 6 -enforce-exclusivity\=checked -Onone -D SWIFT_PACKAGE -D DEBUG -D Xcode -serialize-debugging-options -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception_const_extract_protocols.json -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins/testing -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.derivedData/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode -resource-dir /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -enable-anonymous-context-mangled-names -file-compilation-dir /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.derivedData/SDKStatCaches.noindex/macosx15.4-24E241-8287b8f5db97e746a1562fbca0c9d29b.sdkstatcache -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/swift-overrides.hmap -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -module-name ColorPerception -package-name spi_builder_workspace -frontend-parseable-output -disable-clang-spi -target-sdk-version 15.4 -target-sdk-name macosx15.4 -external-plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins\#/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins\#/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -in-process-plugin-server-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/local/lib/swift/host/plugins -emit-module-doc-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.swiftdoc -emit-module-source-info-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.swiftsourceinfo -emit-objc-header-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-Swift.h -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-master-emit-module.dia -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception-master-emit-module.d -o /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.swiftmodule -emit-abi-descriptor-path /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/ColorPerception.build/Debug/ColorPerception.build/Objects-normal/arm64/ColorPerception.abi.json
EmitSwiftModule normal arm64 (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

/Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/UIColorExtension.swift:8:8: error: no such module 'UIKit'
import UIKit
       ^
SwiftCompile normal arm64 Compiling\ DefaultContrastPairCache.swift /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/DefaultContrastPairCache.swift (in target 'ColorPerception' from project 'ColorPerception')
SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ColorPerception/DefaultContrastPairCache.swift (in target 'ColorPerception' from project 'ColorPerception')
    cd /Users/admin/builder/spi-builder-workspace/.swiftpm/xcode

--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:macOS, arch:arm64, id:eb0648e405ee9e8a7fda95f836403a5cb6c6f572, name:My Mac }
{ platform:macOS, arch:arm64, variant:Mac Catalyst, id:eb0648e405ee9e8a7fda95f836403a5cb6c6f572, name:My Mac }
{ platform:macOS, arch:arm64, variant:DriverKit, id:eb0648e405ee9e8a7fda95f836403a5cb6c6f572, name:My Mac }
{ platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:eb0648e405ee9e8a7fda95f836403a5cb6c6f572, name:My Mac }
** BUILD FAILED **
The following build commands failed:
	SwiftEmitModule normal arm64 Emitting\ module\ for\ ColorPerception (in target 'ColorPerception' from project 'ColorPerception')
	EmitSwiftModule normal arm64 (in target 'ColorPerception' from project 'ColorPerception')
	Building workspace spi-builder-workspace with scheme ColorPerception
(3 failures)
BUILD FAILURE 6.1 macosXcodebuild