refactor: standardize library install path to lib directory

Remove all references to lib64 directory and enforce consistent lib directory usage:
- Force CMAKE_INSTALL_LIBDIR=lib in CMake builds
- Ensure Meson builds use --libdir=lib
- Update pkg-config path to only include lib/pkgconfig
- Modify FFmpeg and other build scripts to only reference lib directory
- Update documentation to reflect the simplified directory structure

This simplifies the build system and ensures more consistent library installation locations.

Author: flexiondotorg

docs/TODO.md

@@ -118,7 +118,6 @@ Build the project using `just build`. Using `just build` is the only valid way t
     ├── etc
     ├── include
     ├── lib
-    ├── lib64
     ├── share
     └── var
 ```

internal/builder/buildsystems.go

@@ -25,12 +25,11 @@ func (a *AutoconfBuild) Configure(lib *Library, srcPath, buildDir, installDir st
 	if !lib.SkipAutoFlags {
 		incDir := filepath.Join(installDir, "include")
 		libDir := filepath.Join(installDir, "lib")
-		lib64Dir := filepath.Join(installDir, "lib64")
 
 		args = append(args,
 			fmt.Sprintf("CFLAGS=-I%s", incDir),
 			fmt.Sprintf("CPPFLAGS=-I%s", incDir),
-			fmt.Sprintf("LDFLAGS=-L%s -L%s", libDir, lib64Dir),
+			fmt.Sprintf("LDFLAGS=-L%s", libDir),
 		)
 	}
 
@@ -107,6 +106,7 @@ func (c *CMakeBuild) Configure(lib *Library, srcPath, buildDir, installDir strin
 		actualSrcPath,
 		fmt.Sprintf("-DCMAKE_INSTALL_PREFIX=%s", installDir),
 		"-DCMAKE_BUILD_TYPE=Release",
+		"-DCMAKE_INSTALL_LIBDIR=lib",
 	}
 
 	if lib.ConfigureArgs != nil {
@@ -163,10 +163,9 @@ func (m *MesonBuild) Configure(lib *Library, srcPath, buildDir, installDir strin
 		buildDir,
 		srcPath,
 		fmt.Sprintf("--prefix=%s", installDir),
-		"--libdir=lib",
-		"--pkgconfigdir=lib/pkgconfig",
 		"--buildtype=release",
 		"--default-library=static",
+		"--libdir=lib",
 	}
 
 	if lib.ConfigureArgs != nil {

internal/builder/libraries.go

@@ -705,12 +705,11 @@ var ffmpeg = &Library{
 		stagingDir, _ := filepath.Abs(".build/staging")
 		incDir := filepath.Join(stagingDir, "include")
 		libDir := filepath.Join(stagingDir, "lib")
-		lib64Dir := filepath.Join(stagingDir, "lib64")
 
 		args := []string{
 			"--pkg-config-flags=--static",
 			fmt.Sprintf("--extra-cflags=-I%s", incDir),
-			fmt.Sprintf("--extra-ldflags=-L%s -L%s", libDir, lib64Dir),
+			fmt.Sprintf("--extra-ldflags=-L%s", libDir),
 		}
 
 		// Add common FFmpeg arguments (platform-specific)

internal/builder/library.go

@@ -170,8 +170,7 @@ func fileExists(path string) bool {
 
 // pkgConfigPath returns the PKG_CONFIG_PATH environment variable
 func pkgConfigPath(installDir string) string {
-	// Include both lib and lib64 pkgconfig directories
-	return filepath.Join(installDir, "lib", "pkgconfig") + ":" + filepath.Join(installDir, "lib64", "pkgconfig")
+	return filepath.Join(installDir, "lib", "pkgconfig")
 }
 
 // buildEnv returns environment variables for building

internal/builder/main.go

@@ -57,7 +57,6 @@ func main() {
 		filepath.Join(buildRoot, "downloads"),
 		filepath.Join(buildRoot, "build"),
 		filepath.Join(stagingDir, "lib"),
-		filepath.Join(stagingDir, "lib64"),
 		filepath.Join(stagingDir, "include"),
 	}
 
@@ -94,7 +93,7 @@ func main() {
 			// Also remove installed libraries from staging
 			if lib.LinkLibs != nil {
 				for _, libName := range lib.LinkLibs {
-					for _, dir := range []string{"lib", "lib64"} {
+					for _, dir := range []string{"lib"} {
 						libPath := filepath.Join(stagingDir, dir, libName+".a")
 						if fileExists(libPath) {
 							os.Remove(libPath)
@@ -171,10 +170,9 @@ func combineLibraries(libs []*Library, stagingDir, output string) error {
 		}
 	}
 
-	// Search for the specific .a files in lib and lib64
+	// Search for the specific .a files in lib
 	libDirs := []string{
 		filepath.Join(stagingDir, "lib"),
-		filepath.Join(stagingDir, "lib64"),
 	}
 
 	for _, libDir := range libDirs {

internal/builder/state.go

@@ -88,8 +88,7 @@ func (s *BuildState) CanSkip(installDir string) bool {
 	}
 
 	// For libraries with LinkLibs, check that all expected .a files exist
-	// Try both lib and lib64 directories (CMake may use either)
-	for _, dir := range []string{"lib", "lib64"} {
+	for _, dir := range []string{"lib"} {
 		libDir := filepath.Join(installDir, dir)
 		allFound := true
 		for _, libName := range s.lib.LinkLibs {

justfile

@@ -4,7 +4,7 @@ default:
 
 # Clean build artifacts and downloads
 clean:
-    @rm -rf .build/ 2>/dev/null || true
+    @rm -rf .build/{build,src,staging} 2>/dev/null || true
     @rm examples/asciiplayer/asciiplayer 2>/dev/null || true
     @rm examples/introspect/introspect 2>/dev/null || true
     @rm examples/metadata/metadata 2>/dev/null || true