Swift Package Index

Build Information

Failed to build SwiftyModbus, reference 2.2.1 (444406), with Swift 6.3 for macOS (SPM) on 13 Apr 2026 18:43:20 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/DimaRU/SwiftyModbus.git
Reference: 2.2.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/DimaRU/SwiftyModbus
 * tag               2.2.1      -> FETCH_HEAD
HEAD is now at 444406b Fix Package definition file errors for Xcode 15/Swift 5.9
Cloned https://github.com/DimaRU/SwiftyModbus.git
Revision (git rev-parse @):
444406bf0d43bf325073e892256c963e5bf77441
SUCCESS checkout https://github.com/DimaRU/SwiftyModbus.git at 2.2.1
Fetching https://github.com/mxcl/PromiseKit.git
[1/17242] Fetching promisekit
Fetched https://github.com/mxcl/PromiseKit.git from cache (2.05s)
Computing version for https://github.com/mxcl/PromiseKit.git
Computed https://github.com/mxcl/PromiseKit.git at 6.22.1 (2.79s)
Creating working copy for https://github.com/mxcl/PromiseKit.git
Working copy of https://github.com/mxcl/PromiseKit.git resolved at 6.22.1
========================================
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",
  "traits": [
    "default"
  ],
  "dependencies": [
    {
      "identity": "swiftymodbus",
      "name": "SwiftyModbus",
      "url": "https://github.com/DimaRU/SwiftyModbus.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/SwiftyModbus",
      "traits": [
        "default"
      ],
      "dependencies": [
        {
          "identity": "promisekit",
          "name": "PromiseKit",
          "url": "https://github.com/mxcl/PromiseKit.git",
          "version": "6.22.1",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/PromiseKit",
          "traits": [
            "default"
          ],
          "dependencies": [
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/DimaRU/SwiftyModbus.git
[1/177] Fetching swiftymodbus
Fetched https://github.com/DimaRU/SwiftyModbus.git from cache (0.82s)
Fetching https://github.com/mxcl/PromiseKit.git from cache
Fetched https://github.com/mxcl/PromiseKit.git from cache (0.56s)
Computing version for https://github.com/mxcl/PromiseKit.git
Computed https://github.com/mxcl/PromiseKit.git at 6.22.1 (0.66s)
Creating working copy for https://github.com/DimaRU/SwiftyModbus.git
Working copy of https://github.com/DimaRU/SwiftyModbus.git resolved at 2.2.1 (444406b)
Creating working copy for https://github.com/mxcl/PromiseKit.git
Working copy of https://github.com/mxcl/PromiseKit.git resolved at 6.22.1
warning: '.resolve-product-dependencies': dependency 'swiftymodbus' is not used by any target
Found 1 product dependencies
  - PromiseKit
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.3
Building package at path:  $PWD
https://github.com/DimaRU/SwiftyModbus.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64
Building for debugging...
[0/4] Write sources
[3/4] Write swift-version--6988338F2F200930.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[5/24] Emitting module SwiftyModbus
<module-includes>:1:9: note: in file included from <module-includes>:1:
1 | #import "libmodbus.h"
  |         `- note: in file included from <module-includes>:1:
2 |
/Users/admin/builder/spi-builder-workspace/Sources/Libmodbus/libmodbus.h:1:9: error: 'modbus.h' file not found
1 | #import <modbus.h>
  |         `- error: 'modbus.h' file not found
2 |
/Users/admin/builder/spi-builder-workspace/Sources/SwiftyModbus/SwiftyModbus.swift:9:8: error: could not build Objective-C module 'CModbus'
  7 |
  8 | import Foundation
  9 | import CModbus
    |        `- error: could not build Objective-C module 'CModbus'
 10 |
 11 | fileprivate let errorValue: Int32 = -1
[6/24] Compiling SwiftyModbus SwiftyModbus.swift
<module-includes>:1:9: note: in file included from <module-includes>:1:
1 | #import "libmodbus.h"
  |         `- note: in file included from <module-includes>:1:
2 |
/Users/admin/builder/spi-builder-workspace/Sources/Libmodbus/libmodbus.h:1:9: error: 'modbus.h' file not found
1 | #import <modbus.h>
  |         `- error: 'modbus.h' file not found
2 |
/Users/admin/builder/spi-builder-workspace/Sources/SwiftyModbus/SwiftyModbus.swift:9:8: error: could not build Objective-C module 'CModbus'
  7 |
  8 | import Foundation
  9 | import CModbus
    |        `- error: could not build Objective-C module 'CModbus'
 10 |
 11 | fileprivate let errorValue: Int32 = -1
[7/24] Compiling SwiftyModbus SwiftyModbusResult.swift
<module-includes>:1:9: note: in file included from <module-includes>:1:
1 | #import "libmodbus.h"
  |         `- note: in file included from <module-includes>:1:
2 |
/Users/admin/builder/spi-builder-workspace/Sources/Libmodbus/libmodbus.h:1:9: error: 'modbus.h' file not found
1 | #import <modbus.h>
  |         `- error: 'modbus.h' file not found
2 |
/Users/admin/builder/spi-builder-workspace/Sources/SwiftyModbus/SwiftyModbus.swift:9:8: error: could not build Objective-C module 'CModbus'
  7 |
  8 | import Foundation
  9 | import CModbus
    |        `- error: could not build Objective-C module 'CModbus'
 10 |
 11 | fileprivate let errorValue: Int32 = -1
[8/24] Compiling PromiseKit race.swift
[9/24] Compiling PromiseKit Resolver.swift
[10/24] Compiling PromiseKit Thenable.swift
warning: failed to retrieve search paths with pkg-config; maybe pkg-config is not installed
warning: you may be able to install libmodbus using your system-packager:
    brew install libmodbus
warning: you may be able to install libmodbus using your system-packager:
    brew install libmodbus
BUILD FAILURE 6.3 macosSpm