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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 PlayDocs, reference master (5eddee), with Swift 6.1 for macOS (SPM) on 24 Apr 2025 18:25:45 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/ldstreet/playdocs.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/ldstreet/playdocs
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 5eddee1 Create CONTRIBUTING.md
Cloned https://github.com/ldstreet/playdocs.git
Revision (git rev-parse @):
5eddee166bc2501dd6a694994e3c70135e83c6e9
SUCCESS checkout https://github.com/ldstreet/playdocs.git at master
Fetching https://github.com/vapor/console.git
Fetching https://github.com/apple/swift-nio-zlib-support.git
Fetching https://github.com/vapor-community/markdown.git
Fetching https://github.com/JohnSundell/Splash
Fetching https://github.com/apple/swift-nio.git from cache
Fetching https://github.com/vapor/service.git
Fetching https://github.com/pointfreeco/swift-overture.git
[1/863] Fetching swift-overture
[79/6348] Fetching swift-overture, console
[299/7267] Fetching swift-overture, console, service
[754/7513] Fetching swift-overture, console, service, markdown
[2118/9680] Fetching swift-overture, console, service, markdown, splash
Fetched https://github.com/vapor/console.git from cache (0.96s)
Fetching https://github.com/scinfu/SwiftSoup.git
[2635/4195] Fetching swift-overture, service, markdown, splash
[4196/4210] Fetching swift-overture, service, markdown, splash, swift-nio-zlib-support
Fetched https://github.com/JohnSundell/Splash from cache (1.43s)
Fetched https://github.com/vapor-community/markdown.git from cache (1.44s)
Fetched https://github.com/vapor/service.git from cache (1.44s)
Fetched https://github.com/apple/swift-nio-zlib-support.git from cache (1.44s)
Fetched https://github.com/pointfreeco/swift-overture.git from cache (1.44s)
Fetched https://github.com/apple/swift-nio.git from cache (1.44s)
Fetching https://github.com/brokenhandsio/cmark-gfm.git
Fetching https://github.com/vapor/core.git
[1/3908] Fetching swiftsoup
[3597/24051] Fetching swiftsoup, core
[3715/36351] Fetching swiftsoup, core, cmark-gfm
Fetched https://github.com/scinfu/SwiftSoup.git from cache (1.12s)
Computing version for https://github.com/pointfreeco/swift-overture.git
[526/32443] Fetching core, cmark-gfm
Fetched https://github.com/brokenhandsio/cmark-gfm.git from cache (1.34s)
Fetched https://github.com/vapor/core.git from cache (1.34s)
Computed https://github.com/pointfreeco/swift-overture.git at 0.3.1 (2.85s)
Computing version for https://github.com/scinfu/SwiftSoup.git
Computed https://github.com/scinfu/SwiftSoup.git at 1.7.5 (0.61s)
Computing version for https://github.com/JohnSundell/Splash
Computed https://github.com/JohnSundell/Splash at 0.1.4 (0.59s)
Computing version for https://github.com/vapor-community/markdown.git
Computed https://github.com/vapor-community/markdown.git at 0.4.0 (0.62s)
Computing version for https://github.com/vapor/console.git
Computed https://github.com/vapor/console.git at 3.1.0 (0.62s)
Computing version for https://github.com/brokenhandsio/cmark-gfm.git
Computed https://github.com/brokenhandsio/cmark-gfm.git at 1.0.1 (0.64s)
Computing version for https://github.com/vapor/service.git
Computed https://github.com/vapor/service.git at 1.0.0 (0.62s)
Computing version for https://github.com/vapor/core.git
Computed https://github.com/vapor/core.git at 3.4.4 (0.63s)
Computing version for https://github.com/apple/swift-nio.git
Computed https://github.com/apple/swift-nio.git at 1.12.0 (0.68s)
Computing version for https://github.com/apple/swift-nio-zlib-support.git
Computed https://github.com/apple/swift-nio-zlib-support.git at 1.0.0 (0.61s)
Creating working copy for https://github.com/scinfu/SwiftSoup.git
Working copy of https://github.com/scinfu/SwiftSoup.git resolved at 1.7.5
Creating working copy for https://github.com/vapor/core.git
Working copy of https://github.com/vapor/core.git resolved at 3.4.4
Creating working copy for https://github.com/pointfreeco/swift-overture.git
Working copy of https://github.com/pointfreeco/swift-overture.git resolved at 0.3.1
Creating working copy for https://github.com/JohnSundell/Splash
Working copy of https://github.com/JohnSundell/Splash resolved at 0.1.4
Creating working copy for https://github.com/vapor-community/markdown.git
Working copy of https://github.com/vapor-community/markdown.git resolved at 0.4.0
Creating working copy for https://github.com/brokenhandsio/cmark-gfm.git
Working copy of https://github.com/brokenhandsio/cmark-gfm.git resolved at 1.0.1
Creating working copy for https://github.com/apple/swift-nio.git
Working copy of https://github.com/apple/swift-nio.git resolved at 1.12.0
Creating working copy for https://github.com/vapor/console.git
Working copy of https://github.com/vapor/console.git resolved at 3.1.0
Creating working copy for https://github.com/apple/swift-nio-zlib-support.git
Working copy of https://github.com/apple/swift-nio-zlib-support.git resolved at 1.0.0
Creating working copy for https://github.com/vapor/service.git
Working copy of https://github.com/vapor/service.git resolved at 1.0.0
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "playdocs",
      "name": "PlayDocs",
      "url": "https://github.com/ldstreet/playdocs.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/playdocs",
      "dependencies": [
        {
          "identity": "console",
          "name": "Console",
          "url": "https://github.com/vapor/console.git",
          "version": "3.1.1",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/console",
          "dependencies": [
            {
              "identity": "core",
              "name": "Core",
              "url": "https://github.com/vapor/core.git",
              "version": "3.10.1",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/core",
              "dependencies": [
                {
                  "identity": "swift-nio",
                  "name": "swift-nio",
                  "url": "https://github.com/apple/swift-nio.git",
                  "version": "1.14.4",
                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-nio",
                  "dependencies": [
                    {
                      "identity": "swift-nio-zlib-support",
                      "name": "swift-nio-zlib-support",
                      "url": "https://github.com/apple/swift-nio-zlib-support.git",
                      "version": "1.0.0",
                      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-nio-zlib-support",
                      "dependencies": [
                      ]
                    }
                  ]
                }
              ]
            },
            {
              "identity": "service",
              "name": "Service",
              "url": "https://github.com/vapor/service.git",
              "version": "1.0.2",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/service",
              "dependencies": [
                {
                  "identity": "core",
                  "name": "Core",
                  "url": "https://github.com/vapor/core.git",
                  "version": "3.10.1",
                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/core",
                  "dependencies": [
                    {
                      "identity": "swift-nio",
                      "name": "swift-nio",
                      "url": "https://github.com/apple/swift-nio.git",
                      "version": "1.14.4",
                      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-nio",
                      "dependencies": [
                        {
                          "identity": "swift-nio-zlib-support",
                          "name": "swift-nio-zlib-support",
                          "url": "https://github.com/apple/swift-nio-zlib-support.git",
                          "version": "1.0.0",
                          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-nio-zlib-support",
                          "dependencies": [
                          ]
                        }
                      ]
                    }
                  ]
                }
              ]
            }
          ]
        },
        {
          "identity": "markdown",
          "name": "SwiftMarkdown",
          "url": "https://github.com/vapor-community/markdown.git",
          "version": "0.7.1",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/markdown",
          "dependencies": [
            {
              "identity": "cmark-gfm",
              "name": "cmark",
              "url": "https://github.com/brokenhandsio/cmark-gfm.git",
              "version": "2.1.0",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/cmark-gfm",
              "dependencies": [
              ]
            }
          ]
        },
        {
          "identity": "splash",
          "name": "Splash",
          "url": "https://github.com/JohnSundell/Splash",
          "version": "0.16.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Splash",
          "dependencies": [
          ]
        },
        {
          "identity": "swiftsoup",
          "name": "SwiftSoup",
          "url": "https://github.com/scinfu/SwiftSoup.git",
          "version": "1.7.5",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/SwiftSoup",
          "dependencies": [
          ]
        },
        {
          "identity": "swift-overture",
          "name": "Overture",
          "url": "https://github.com/pointfreeco/swift-overture.git",
          "version": "0.5.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-overture",
          "dependencies": [
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/ldstreet/playdocs.git
[1/544] Fetching playdocs
Fetched https://github.com/ldstreet/playdocs.git from cache (1.26s)
Fetching https://github.com/pointfreeco/swift-overture.git from cache
Fetching https://github.com/vapor-community/markdown.git from cache
Fetching https://github.com/scinfu/SwiftSoup.git from cache
Fetching https://github.com/vapor/console.git from cache
Fetching https://github.com/JohnSundell/Splash from cache
Fetched https://github.com/pointfreeco/swift-overture.git from cache (0.48s)
Fetched https://github.com/JohnSundell/Splash from cache (1.12s)
Fetched https://github.com/vapor-community/markdown.git from cache (1.12s)
Fetched https://github.com/scinfu/SwiftSoup.git from cache (1.12s)
Fetched https://github.com/vapor/console.git from cache (1.12s)
Computing version for https://github.com/scinfu/SwiftSoup.git
Computed https://github.com/scinfu/SwiftSoup.git at 1.7.5 (1.18s)
Computing version for https://github.com/pointfreeco/swift-overture.git
Computed https://github.com/pointfreeco/swift-overture.git at 0.5.0 (0.66s)
Computing version for https://github.com/vapor-community/markdown.git
Computed https://github.com/vapor-community/markdown.git at 0.7.1 (0.56s)
Fetching https://github.com/brokenhandsio/cmark-gfm.git from cache
Fetched https://github.com/brokenhandsio/cmark-gfm.git from cache (0.44s)
Computing version for https://github.com/brokenhandsio/cmark-gfm.git
Computed https://github.com/brokenhandsio/cmark-gfm.git at 2.1.0 (1.03s)
Computing version for https://github.com/vapor/console.git
Computed https://github.com/vapor/console.git at 3.1.1 (0.03s)
Fetching https://github.com/vapor/service.git from cache
Fetching https://github.com/vapor/core.git from cache
Fetched https://github.com/vapor/core.git from cache (0.53s)
Fetched https://github.com/vapor/service.git from cache (0.53s)
Computing version for https://github.com/vapor/service.git
Computed https://github.com/vapor/service.git at 1.0.2 (0.59s)
Computing version for https://github.com/JohnSundell/Splash
Computed https://github.com/JohnSundell/Splash at 0.16.0 (0.58s)
Computing version for https://github.com/vapor/core.git
Computed https://github.com/vapor/core.git at 3.10.1 (0.58s)
Fetching https://github.com/apple/swift-nio.git from cache
Fetched https://github.com/apple/swift-nio.git from cache (0.71s)
Computing version for https://github.com/apple/swift-nio.git
Computed https://github.com/apple/swift-nio.git at 1.14.4 (0.76s)
Fetching https://github.com/apple/swift-nio-zlib-support.git from cache
Fetched https://github.com/apple/swift-nio-zlib-support.git from cache (0.45s)
Computing version for https://github.com/apple/swift-nio-zlib-support.git
Computed https://github.com/apple/swift-nio-zlib-support.git at 1.0.0 (0.50s)
Creating working copy for https://github.com/vapor-community/markdown.git
Working copy of https://github.com/vapor-community/markdown.git resolved at 0.7.1
Creating working copy for https://github.com/JohnSundell/Splash
Working copy of https://github.com/JohnSundell/Splash resolved at 0.16.0
Creating working copy for https://github.com/apple/swift-nio-zlib-support.git
Working copy of https://github.com/apple/swift-nio-zlib-support.git resolved at 1.0.0
Creating working copy for https://github.com/scinfu/SwiftSoup.git
Working copy of https://github.com/scinfu/SwiftSoup.git resolved at 1.7.5
Creating working copy for https://github.com/brokenhandsio/cmark-gfm.git
Working copy of https://github.com/brokenhandsio/cmark-gfm.git resolved at 2.1.0
Creating working copy for https://github.com/ldstreet/playdocs.git
Working copy of https://github.com/ldstreet/playdocs.git resolved at master (5eddee1)
Creating working copy for https://github.com/vapor/service.git
Working copy of https://github.com/vapor/service.git resolved at 1.0.2
Creating working copy for https://github.com/vapor/console.git
Working copy of https://github.com/vapor/console.git resolved at 3.1.1
Creating working copy for https://github.com/pointfreeco/swift-overture.git
Working copy of https://github.com/pointfreeco/swift-overture.git resolved at 0.5.0
Creating working copy for https://github.com/vapor/core.git
Working copy of https://github.com/vapor/core.git resolved at 3.10.1
Creating working copy for https://github.com/apple/swift-nio.git
Working copy of https://github.com/apple/swift-nio.git resolved at 1.14.4
warning: 'swift-nio-zlib-support': ignoring declared target(s) 'swift-nio-zlib-support' in the system package
Found 5 product dependencies
  - Console
  - SwiftMarkdown
  - Splash
  - SwiftSoup
  - Overture
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/ldstreet/playdocs.git
https://github.com/ldstreet/playdocs.git
{
  "dependencies" : [
    {
      "identity" : "console",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "3.0.0",
            "upper_bound" : "4.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/vapor/console.git"
    },
    {
      "identity" : "markdown",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.4.0",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/vapor-community/markdown.git"
    },
    {
      "identity" : "splash",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.1.4",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/JohnSundell/Splash"
    },
    {
      "identity" : "swiftsoup",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.7.4",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/scinfu/SwiftSoup.git"
    },
    {
      "identity" : "swift-overture",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.3.1",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/pointfreeco/swift-overture.git"
    }
  ],
  "manifest_display_name" : "PlayDocs",
  "name" : "PlayDocs",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "playdocs",
      "targets" : [
        "PlayDocs"
      ],
      "type" : {
        "executable" : null
      }
    },
    {
      "name" : "PlayDocsKit",
      "targets" : [
        "PlayDocsKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PlayDocsKitTests",
      "module_type" : "SwiftTarget",
      "name" : "PlayDocsKitTests",
      "path" : "Tests/PlayDocsKitTests",
      "sources" : [
        "ConvertTests.swift",
        "ConvertToHTMLTests .swift",
        "ConvertToMarkdownTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "PlayDocsKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "PlayDocsKit",
      "module_type" : "SwiftTarget",
      "name" : "PlayDocsKit",
      "path" : "Sources/PlayDocsKit",
      "product_dependencies" : [
        "Console",
        "Command",
        "Splash",
        "SwiftSoup",
        "SwiftMarkdown"
      ],
      "product_memberships" : [
        "playdocs",
        "PlayDocsKit"
      ],
      "sources" : [
        "Chunk.swift",
        "Common/String+Extensions.swift",
        "Converter.swift",
        "Token.swift",
        "World.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "PlayDocs",
      "module_type" : "SwiftTarget",
      "name" : "PlayDocs",
      "path" : "Sources/PlayDocs",
      "product_dependencies" : [
        "Console",
        "Command",
        "Overture"
      ],
      "product_memberships" : [
        "playdocs"
      ],
      "sources" : [
        "Common/CommandArguments.swift",
        "Common/CommandContext+Extensions.swift",
        "Common/CommandFlags.swift",
        "Common/CommandOptions.swift",
        "Common/CommandProtocol.swift",
        "ConvertCommand.swift",
        "NewCommand.swift",
        "main.swift"
      ],
      "target_dependencies" : [
        "PlayDocsKit"
      ],
      "type" : "executable"
    }
  ],
  "tools_version" : "4.2"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
Building for debugging...
[0/60] Write sources
[4/60] Write playdocs-entitlement.plist
[7/60] Write sources
[8/60] Write swift-version-2F0A5646E1D333AE.txt
[9/60] Compiling cmark render.c
[10/60] Compiling cmark strikethrough.c
[11/60] Compiling cmark registry.c
[11/60] Compiling cmark references.c
[13/60] Compiling cmark table.c
[14/60] Compiling cmark utf8.c
[15/60] Compiling cmark plugin.c
[16/60] Compiling cmark plaintext.c
[17/60] Compiling cmark tagfilter.c
[18/60] Compiling cmark node.c
[19/60] Compiling cmark linked_list.c
[20/60] Compiling cmark man.c
[21/60] Compiling cmark scanners.c
[22/60] Compiling cmark syntax_extension.c
[23/60] Compiling cmark latex.c
[24/69] Compiling cmark iterator.c
[25/83] Compiling cmark html.c
[26/98] Compiling cmark houdini_html_e.c
[27/107] Compiling cmark xml.c
[28/150] Compiling cmark inlines.c
[29/150] Compiling cmark houdini_html_u.c
[30/150] Compiling cmark houdini_href_e.c
[31/150] Compiling cmark cmark_ctype.c
[32/150] Compiling cmark core-extensions.c
[33/150] Compiling cmark cmark.c
[34/150] Write sources
[37/150] Compiling cmark buffer.c
[38/150] Write sources
[43/150] Compiling cmark ext_scanners.c
[44/150] Write sources
[46/150] Compiling cmark arena.c
[47/150] Compiling cmark commonmark.c
[48/150] Compiling CNIOLinux shim.c
[49/150] Compiling CNIOLinux ifaddrs-android.c
[50/150] Compiling cmark blocks.c
[51/159] Compiling cmark autolink.c
[52/159] Write sources
[54/159] Compiling CNIOSHA1 c_nio_sha1.c
[56/159] Compiling Overture ZipOptional.swift
[57/159] Compiling Overture With.swift
[58/159] Compiling Overture ZipSequence.swift
[58/162] Compiling CNIODarwin shim.c
[60/162] Compiling Overture Zurry.swift
[61/162] Compiling SwiftSoup DocumentType.swift
[62/162] Compiling SwiftSoup Element.swift
[63/162] Emitting module Overture
[64/162] Compiling SwiftSoup DataUtil.swift
[65/162] Compiling SwiftSoup Document.swift
[66/162] Compiling Overture Uncurry.swift
[67/162] Compiling SwiftMarkdown SwiftMarkdown.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/markdown/Sources/SwiftMarkdown/SwiftMarkdown.swift:26:50: error: cannot find 'strlen' in scope
24 | 	var buffer: String?
25 | 	try str.withCString {
26 | 		guard let buf = cmark_markdown_to_html($0, Int(strlen($0)), options.rawValue) else {
   |                                                  `- error: cannot find 'strlen' in scope
27 | 			throw MarkdownError.conversionFailed
28 | 		}
/Users/admin/builder/spi-builder-workspace/.build/checkouts/markdown/Sources/SwiftMarkdown/SwiftMarkdown.swift:30:3: error: cannot find 'free' in scope
28 | 		}
29 | 		buffer = String(cString: buf)
30 | 		free(buf)
   |   `- error: cannot find 'free' in scope
31 | 	}
32 | 	guard let output = buffer else {
[68/162] Emitting module SwiftMarkdown
[68/162] Compiling c-atomics.c
[69/162] Compiling SwiftSoup CharacterExt.swift
[70/162] Compiling SwiftSoup CharacterReader.swift
[71/162] Compiling SwiftSoup ArrayExt.swift
[72/162] Compiling SwiftSoup Attribute.swift
warning: 'swift-nio-zlib-support': ignoring declared target(s) 'swift-nio-zlib-support' in the system package
warning: failed to retrieve search paths with pkg-config; maybe pkg-config is not installed
warning: couldn't find pc file for zlib
warning: couldn't find pc file for zlib
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
[0/1] Planning build
Building for debugging...
[0/5] Write swift-version-2F0A5646E1D333AE.txt
[2/106] Compiling SwiftSoup CharacterExt.swift
[3/106] Compiling SwiftSoup CharacterReader.swift
[4/107] Compiling SwiftSoup Cleaner.swift
[5/107] Compiling SwiftSoup Collector.swift
[6/107] Emitting module SwiftMarkdown
[7/107] Compiling SwiftMarkdown SwiftMarkdown.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/markdown/Sources/SwiftMarkdown/SwiftMarkdown.swift:26:50: error: cannot find 'strlen' in scope
24 | 	var buffer: String?
25 | 	try str.withCString {
26 | 		guard let buf = cmark_markdown_to_html($0, Int(strlen($0)), options.rawValue) else {
   |                                                  `- error: cannot find 'strlen' in scope
27 | 			throw MarkdownError.conversionFailed
28 | 		}
/Users/admin/builder/spi-builder-workspace/.build/checkouts/markdown/Sources/SwiftMarkdown/SwiftMarkdown.swift:30:3: error: cannot find 'free' in scope
28 | 		}
29 | 		buffer = String(cString: buf)
30 | 		free(buf)
   |   `- error: cannot find 'free' in scope
31 | 	}
32 | 	guard let output = buffer else {
[7/107] Compiling c-atomics.c
warning: 'swift-nio-zlib-support': ignoring declared target(s) 'swift-nio-zlib-support' in the system package
warning: failed to retrieve search paths with pkg-config; maybe pkg-config is not installed
warning: couldn't find pc file for zlib
warning: couldn't find pc file for zlib
BUILD FAILURE 6.1 macosSpm