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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 0.1.0 (2c7267), with Swift 6.1 for macOS (SPM) on 24 Apr 2025 18:25:51 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: 0.1.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/ldstreet/playdocs
 * tag               0.1.0      -> FETCH_HEAD
HEAD is now at 2c72671 fixed tests
Cloned https://github.com/ldstreet/playdocs.git
Revision (git rev-parse @):
2c7267188827186eccd4343edb68645722f69b59
SUCCESS checkout https://github.com/ldstreet/playdocs.git at 0.1.0
Fetching https://github.com/brokenhandsio/cmark-gfm.git
Fetching https://github.com/apple/swift-nio-zlib-support.git
Fetching https://github.com/scinfu/SwiftSoup.git
Fetching https://github.com/apple/swift-nio.git from cache
Fetching https://github.com/JohnSundell/Splash
Fetching https://github.com/vapor/service.git
Fetching https://github.com/pointfreeco/swift-overture.git
[1/15] Fetching swift-nio-zlib-support
[16/12315] Fetching swift-nio-zlib-support, cmark-gfm
[17/14482] Fetching swift-nio-zlib-support, cmark-gfm, splash
[126/18390] Fetching swift-nio-zlib-support, cmark-gfm, splash, swiftsoup
[248/19309] Fetching swift-nio-zlib-support, cmark-gfm, splash, swiftsoup, service
[537/20172] Fetching swift-nio-zlib-support, cmark-gfm, splash, swiftsoup, service, swift-overture
Fetched https://github.com/scinfu/SwiftSoup.git from cache (1.10s)
[8392/16264] Fetching swift-nio-zlib-support, cmark-gfm, splash, service, swift-overture
Fetching https://github.com/vapor-community/markdown.git
Fetched https://github.com/vapor/service.git from cache (1.36s)
Fetched https://github.com/brokenhandsio/cmark-gfm.git from cache (1.36s)
Fetched https://github.com/JohnSundell/Splash from cache (1.36s)
Fetched https://github.com/apple/swift-nio-zlib-support.git from cache (1.36s)
Fetched https://github.com/pointfreeco/swift-overture.git from cache (1.36s)
Fetched https://github.com/apple/swift-nio.git from cache (1.36s)
Fetching https://github.com/vapor/console.git
Fetching https://github.com/vapor/core.git
[1/246] Fetching markdown
Fetched https://github.com/vapor-community/markdown.git from cache (0.68s)
[1/20143] Fetching core
[2/25628] Fetching core, console
Fetched https://github.com/vapor/console.git from cache (1.03s)
Computing version for https://github.com/pointfreeco/swift-overture.git
[14503/20143] Fetching core
Fetched https://github.com/vapor/core.git from cache (1.31s)
Computed https://github.com/pointfreeco/swift-overture.git at 0.3.1 (3.08s)
Computing version for https://github.com/scinfu/SwiftSoup.git
Computed https://github.com/scinfu/SwiftSoup.git at 1.7.5 (0.57s)
Computing version for https://github.com/JohnSundell/Splash
Computed https://github.com/JohnSundell/Splash at 0.1.4 (0.55s)
Computing version for https://github.com/vapor-community/markdown.git
Computed https://github.com/vapor-community/markdown.git at 0.4.0 (0.57s)
Computing version for https://github.com/vapor/console.git
Computed https://github.com/vapor/console.git at 3.1.0 (0.58s)
Computing version for https://github.com/brokenhandsio/cmark-gfm.git
Computed https://github.com/brokenhandsio/cmark-gfm.git at 1.0.1 (0.59s)
Computing version for https://github.com/vapor/service.git
Computed https://github.com/vapor/service.git at 1.0.0 (0.56s)
Computing version for https://github.com/vapor/core.git
Computed https://github.com/vapor/core.git at 3.4.4 (0.58s)
Computing version for https://github.com/apple/swift-nio.git
Computed https://github.com/apple/swift-nio.git at 1.12.0 (0.60s)
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 (0.58s)
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/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/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/JohnSundell/Splash
Working copy of https://github.com/JohnSundell/Splash resolved at 0.1.4
Creating working copy for https://github.com/vapor/service.git
Working copy of https://github.com/vapor/service.git resolved at 1.0.0
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/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/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/scinfu/SwiftSoup.git
Working copy of https://github.com/scinfu/SwiftSoup.git resolved at 1.7.5
========================================
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 (1.16s)
Fetching https://github.com/vapor/console.git from cache
Fetching https://github.com/scinfu/SwiftSoup.git from cache
Fetching https://github.com/vapor-community/markdown.git from cache
Fetching https://github.com/pointfreeco/swift-overture.git from cache
Fetching https://github.com/JohnSundell/Splash from cache
Fetched https://github.com/vapor-community/markdown.git from cache (0.48s)
Fetched https://github.com/pointfreeco/swift-overture.git from cache (0.48s)
Fetched https://github.com/vapor/console.git from cache (0.51s)
Fetched https://github.com/JohnSundell/Splash from cache (0.51s)
Fetched https://github.com/scinfu/SwiftSoup.git from cache (0.51s)
Computing version for https://github.com/scinfu/SwiftSoup.git
Computed https://github.com/scinfu/SwiftSoup.git at 1.7.5 (0.57s)
Computing version for https://github.com/pointfreeco/swift-overture.git
Computed https://github.com/pointfreeco/swift-overture.git at 0.5.0 (0.63s)
Computing version for https://github.com/vapor-community/markdown.git
Computed https://github.com/vapor-community/markdown.git at 0.7.1 (0.53s)
Fetching https://github.com/brokenhandsio/cmark-gfm.git from cache
Fetched https://github.com/brokenhandsio/cmark-gfm.git from cache (0.57s)
Computing version for https://github.com/brokenhandsio/cmark-gfm.git
Computed https://github.com/brokenhandsio/cmark-gfm.git at 2.1.0 (1.14s)
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
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Fetched https://github.com/vapor/core.git from cache (0.50s)
Fetched https://github.com/vapor/service.git from cache (0.50s)
Computing version for https://github.com/vapor/service.git
Computed https://github.com/vapor/service.git at 1.0.2 (0.56s)
Computing version for https://github.com/JohnSundell/Splash
Computed https://github.com/JohnSundell/Splash at 0.16.0 (0.53s)
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Computed https://github.com/vapor/core.git at 3.10.1 (0.53s)
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Fetched https://github.com/apple/swift-nio.git from cache (0.70s)
Computing version for https://github.com/apple/swift-nio.git
Computed https://github.com/apple/swift-nio.git at 1.14.4 (0.75s)
Fetching https://github.com/apple/swift-nio-zlib-support.git from cache
Fetched https://github.com/apple/swift-nio-zlib-support.git from cache (0.44s)
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 (0.49s)
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/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
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/JohnSundell/Splash
Working copy of https://github.com/JohnSundell/Splash resolved at 0.16.0
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/console.git
Working copy of https://github.com/vapor/console.git resolved at 3.1.1
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/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/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/ldstreet/playdocs.git
Working copy of https://github.com/ldstreet/playdocs.git resolved at 0.1.0 (2c72671)
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 playdocs-entitlement.plist
[0/60] Write sources
[2/60] Write swift-version-2F0A5646E1D333AE.txt
[3/60] Compiling cmark tagfilter.c
[4/60] Compiling cmark strikethrough.c
[5/60] Compiling cmark xml.c
[5/60] Compiling cmark registry.c
[5/60] Compiling cmark syntax_extension.c
[5/60] Compiling cmark references.c
[9/60] Compiling cmark table.c
[10/60] Compiling cmark utf8.c
[11/60] Compiling cmark plugin.c
[12/60] Compiling cmark linked_list.c
[13/60] Compiling cmark plaintext.c
[14/60] Compiling cmark man.c
[15/60] Compiling cmark latex.c
[16/60] Compiling cmark node.c
[17/60] Compiling cmark iterator.c
[18/60] Compiling cmark scanners.c
[19/60] Compiling cmark houdini_html_e.c
[20/60] Compiling cmark html.c
[21/60] Compiling cmark houdini_href_e.c
[22/69] Compiling cmark core-extensions.c
[23/74] Compiling cmark render.c
[24/81] Compiling cmark ext_scanners.c
[25/83] Compiling cmark inlines.c
[25/83] Write sources
[25/83] Compiling cmark houdini_html_u.c
[25/83] Write sources
[38/83] Compiling cmark commonmark.c
[39/83] Compiling cmark cmark_ctype.c
[40/83] Write sources
[42/83] Compiling cmark cmark.c
[43/83] Write sources
[46/83] Compiling cmark arena.c
[47/83] Compiling cmark blocks.c
[48/83] Compiling cmark buffer.c
[49/83] Compiling CNIOLinux shim.c
[50/83] Compiling CNIOLinux ifaddrs-android.c
[51/159] Compiling cmark autolink.c
[52/159] Write sources
[54/159] Compiling CNIODarwin shim.c
[56/161] Compiling Overture ZipOptional.swift
[57/161] Compiling Overture With.swift
[58/161] Compiling Overture ZipSequence.swift
[59/162] 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 {
[60/162] Compiling Overture Zurry.swift
[61/162] Emitting module SwiftMarkdown
[61/162] Compiling CNIOSHA1 c_nio_sha1.c
[62/162] Compiling SwiftSoup StreamReader.swift
[63/162] Compiling SwiftSoup String.swift
[64/162] Compiling SwiftSoup SerializationException.swift
[65/162] Compiling SwiftSoup SimpleDictionary.swift
[65/162] 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
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
[0/1] Planning build
Building for debugging...
[0/6] Compiling CNIOSHA1 c_nio_sha1.c
[1/6] Write swift-version-2F0A5646E1D333AE.txt
[3/107] 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 {
[4/107] Emitting module SwiftMarkdown
[5/107] Compiling SwiftSoup CombiningEvaluator.swift
[6/107] Compiling SwiftSoup Comment.swift
[6/107] 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