fix: resolve automake version mismatch issues in builds

- Add `touchAutomakeFiles` utility function to prevent automake regeneration
- Implement the function for speex build process
- Simplify macOS dependency installation by removing automake symlinks

This change addresses issues with automake version mismatches where macOS has a newer
automake version (1.18) than what was used to configure speex (1.16).

Author: flexiondotorg

.github/workflows/ffmpeg.yml

@@ -51,12 +51,7 @@ jobs:
 
       - name: Install macOS dependencies
         if: matrix.os == 'darwin'
-        run: |
-          brew update
-          brew install yasm autoconf ragel meson nasm automake libtool
-          # Create compatibility symlinks for older automake version references
-          ln -sf $(which aclocal) /usr/local/bin/aclocal-1.16
-          ln -sf $(which automake) /usr/local/bin/automake-1.16
+        run: brew update && brew install yasm autoconf ragel meson nasm automake libtool
 
       - name: Create build directory
         run: mkdir -p build

internal/builder/main.go

@@ -398,6 +398,9 @@ func buildSpeex() {
 		run("[speex configure]", cmd)
 	}
 
+	// Prevent automake regeneration (macOS has automake 1.18 but speex was configured with 1.16)
+	touchAutomakeFiles(srcPath)
+
 	{
 		log.Println("Running make")
 

internal/builder/utils.go

@@ -450,3 +450,40 @@ func modify(path string, mod func([]byte) []byte) {
 		log.Panicln(err)
 	}
 }
+
+// touchAutomakeFiles updates timestamps on automake-generated files to prevent
+// Make from trying to regenerate them. This works around automake version mismatches
+// where the tarball was configured with a different automake version than installed.
+func touchAutomakeFiles(srcPath string) {
+	now := time.Now()
+
+	// Touch all automake-generated files to be newer than their sources
+	// This prevents Make from invoking automake to regenerate them
+	files := []string{
+		"aclocal.m4",
+		"Makefile.in",
+		"config.h.in",
+		"configure",
+	}
+
+	for _, file := range files {
+		fullPath := filepath.Join(srcPath, file)
+		if _, err := os.Stat(fullPath); err == nil {
+			// File exists, update its timestamp
+			if err := os.Chtimes(fullPath, now, now); err != nil {
+				log.Printf("Warning: failed to touch %s: %v", file, err)
+			}
+		}
+	}
+
+	// Also touch any Makefile.in files in subdirectories
+	filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if !info.IsDir() && info.Name() == "Makefile.in" {
+			os.Chtimes(path, now, now)
+		}
+		return nil
+	})
+}