diff --git a/.github/workflows/release-build.yml b/.github/workflows/release-build.yml
index 5740a631..54748575 100644
--- a/.github/workflows/release-build.yml
+++ b/.github/workflows/release-build.yml
@@ -38,6 +38,9 @@ jobs:
           - name: "windows-x64"
             os: "ubuntu-latest"
             filename: "spc-windows-x64.exe"
+    permissions:
+      id-token: write
+      attestations: write
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v5"
@@ -105,6 +108,12 @@ jobs:
             fi
           fi
 
+      - name: "Generate build provenance attestation"
+        if: github.event_name != 'pull_request'
+        uses: actions/attest-build-provenance@v4
+        with:
+          subject-path: "${{ github.workspace }}/${{ matrix.operating-system.name == 'windows-x64' && 'spc.exe' || 'spc' }}"
+
       - name: "Copy file"
         run: |
           if [ "${{ matrix.operating-system.name }}" != "windows-x64" ]; then
diff --git a/src/StaticPHP/Doctor/Item/LinuxMuslCheck.php b/src/StaticPHP/Doctor/Item/LinuxMuslCheck.php
index df3b5241..1fe7ed00 100644
--- a/src/StaticPHP/Doctor/Item/LinuxMuslCheck.php
+++ b/src/StaticPHP/Doctor/Item/LinuxMuslCheck.php
@@ -73,13 +73,20 @@ class LinuxMuslCheck
             $prefix = 'sudo ';
             logger()->warning('Current user is not root, using sudo for running command');
         }
+        $sysEnv = ['CC' => 'gcc', 'CXX' => 'g++', 'AR' => 'ar', 'LD' => 'ld', 'RANLIB' => 'ranlib'];
+        $envFlags = '';
+        foreach ($sysEnv as $k => $v) {
+            $envFlags .= "{$k}={$v} ";
+        }
+        $envFlags = rtrim($envFlags);
         $shell = shell()->cd(SOURCE_PATH . '/musl-wrapper')
-            ->exec('CC=gcc CXX=g++ AR=ar LD=ld ./configure --disable-gcc-wrapper')
-            ->exec('CC=gcc CXX=g++ AR=ar LD=ld make -j');
+            ->setEnv($sysEnv)
+            ->exec('./configure --disable-gcc-wrapper')
+            ->exec('make -j');
         if ($prefix !== '') {
-            f_passthru('cd ' . SOURCE_PATH . "/musl-wrapper && CC=gcc CXX=g++ AR=ar LD=ld {$prefix}make install");
+            f_passthru('cd ' . SOURCE_PATH . "/musl-wrapper && {$envFlags} {$prefix}make install");
         } else {
-            $shell->exec("CC=gcc CXX=g++ AR=ar LD=ld {$prefix}make install");
+            $shell->exec("{$prefix}make install");
         }
         return true;
     }
diff --git a/src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php b/src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php
index 82fa468a..9fc00840 100644
--- a/src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php
+++ b/src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php
@@ -302,9 +302,12 @@ set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
 set(CMAKE_C_STANDARD_INCLUDE_DIRECTORIES "{$include}")
 set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES "{$include}")
 CMAKE;
-        // Whoops, linux may need CMAKE_AR sometimes
+        // pin AR/RANLIB so cmake uses zig-ar/zig-ranlib instead of system /usr/bin/ranlib (zig archives need it)
         if (PHP_OS_FAMILY === 'Linux') {
-            $toolchain .= "\nSET(CMAKE_AR \"ar\")";
+            $ar = getenv('SPC_DEFAULT_AR') ?: getenv('AR') ?: 'ar';
+            $ranlib = getenv('SPC_DEFAULT_RANLIB') ?: (getenv('RANLIB') ?: 'ranlib');
+            $toolchain .= "\nSET(CMAKE_AR \"{$ar}\")";
+            $toolchain .= "\nSET(CMAKE_RANLIB \"{$ranlib}\")";
         }
         FileSystem::writeFile(SOURCE_PATH . '/toolchain.cmake', $toolchain);
         return $created = realpath(SOURCE_PATH . '/toolchain.cmake');
diff --git a/src/StaticPHP/Toolchain/ClangBrewToolchain.php b/src/StaticPHP/Toolchain/ClangBrewToolchain.php
index 5d8963ef..23260954 100644
--- a/src/StaticPHP/Toolchain/ClangBrewToolchain.php
+++ b/src/StaticPHP/Toolchain/ClangBrewToolchain.php
@@ -15,6 +15,7 @@ class ClangBrewToolchain extends ClangNativeToolchain
         GlobalEnvManager::putenv("SPC_DEFAULT_CC={$homebrew_prefix}/opt/llvm/bin/clang");
         GlobalEnvManager::putenv("SPC_DEFAULT_CXX={$homebrew_prefix}/opt/llvm/bin/clang++");
         GlobalEnvManager::putenv("SPC_DEFAULT_AR={$homebrew_prefix}/opt/llvm/bin/llvm-ar");
+        GlobalEnvManager::putenv("SPC_DEFAULT_RANLIB={$homebrew_prefix}/opt/llvm/bin/llvm-ranlib");
         GlobalEnvManager::putenv('SPC_DEFAULT_LD=ld');
         GlobalEnvManager::addPathIfNotExists("{$homebrew_prefix}/opt/llvm/bin");
     }
diff --git a/src/StaticPHP/Toolchain/ClangNativeToolchain.php b/src/StaticPHP/Toolchain/ClangNativeToolchain.php
index 27ae2b65..7602c3ed 100644
--- a/src/StaticPHP/Toolchain/ClangNativeToolchain.php
+++ b/src/StaticPHP/Toolchain/ClangNativeToolchain.php
@@ -21,6 +21,7 @@ class ClangNativeToolchain implements UnixToolchainInterface
         GlobalEnvManager::putenv('SPC_DEFAULT_CC=clang');
         GlobalEnvManager::putenv('SPC_DEFAULT_CXX=clang++');
         GlobalEnvManager::putenv('SPC_DEFAULT_AR=ar');
+        GlobalEnvManager::putenv('SPC_DEFAULT_RANLIB=ranlib');
         GlobalEnvManager::putenv('SPC_DEFAULT_LD=ld');
     }
 
diff --git a/src/StaticPHP/Toolchain/GccNativeToolchain.php b/src/StaticPHP/Toolchain/GccNativeToolchain.php
index 7c339e69..9aecb7e0 100644
--- a/src/StaticPHP/Toolchain/GccNativeToolchain.php
+++ b/src/StaticPHP/Toolchain/GccNativeToolchain.php
@@ -18,6 +18,7 @@ class GccNativeToolchain implements UnixToolchainInterface
         GlobalEnvManager::putenv('SPC_DEFAULT_CC=gcc');
         GlobalEnvManager::putenv('SPC_DEFAULT_CXX=g++');
         GlobalEnvManager::putenv('SPC_DEFAULT_AR=ar');
+        GlobalEnvManager::putenv('SPC_DEFAULT_RANLIB=ranlib');
         GlobalEnvManager::putenv('SPC_DEFAULT_LD=ld');
     }
 
diff --git a/src/StaticPHP/Toolchain/ZigToolchain.php b/src/StaticPHP/Toolchain/ZigToolchain.php
index 36e42d04..f9048ad3 100644
--- a/src/StaticPHP/Toolchain/ZigToolchain.php
+++ b/src/StaticPHP/Toolchain/ZigToolchain.php
@@ -16,6 +16,7 @@ class ZigToolchain implements UnixToolchainInterface
         GlobalEnvManager::putenv('SPC_DEFAULT_CC=zig-cc');
         GlobalEnvManager::putenv('SPC_DEFAULT_CXX=zig-c++');
         GlobalEnvManager::putenv('SPC_DEFAULT_AR=zig-ar');
+        GlobalEnvManager::putenv('SPC_DEFAULT_RANLIB=zig-ranlib');
         GlobalEnvManager::putenv('SPC_DEFAULT_LD=zig-ld.lld');
 
         // Generate additional objects needed for zig toolchain
diff --git a/src/globals/functions.php b/src/globals/functions.php
index 549ef498..c824bd3d 100644
--- a/src/globals/functions.php
+++ b/src/globals/functions.php
@@ -256,10 +256,30 @@ function clean_spaces(string $string): string
  */
 function deduplicate_flags(string $flags): string
 {
-    $tokens = preg_split('/\s+/', trim($flags));
+    // Flags that take their value as a separate token.
+    static $paired = [
+        '-Xclang', '-Xpreprocessor', '-Xlinker', '-Xassembler',
+        '-framework', '-arch', '-target',
+        '-include', '-imacros', '-isystem', '-isysroot', '-iquote', '-idirafter',
+        '-MT', '-MF', '-MQ',
+    ];
+
+    $tokens = preg_split('/\s+/', trim($flags)) ?: [];
+
+    // Group paired flag+value into a single atom before dedup.
+    $atoms = [];
+    $n = count($tokens);
+    for ($i = 0; $i < $n; ++$i) {
+        if (in_array($tokens[$i], $paired, true) && $i + 1 < $n) {
+            $atoms[] = $tokens[$i] . ' ' . $tokens[$i + 1];
+            ++$i;
+        } else {
+            $atoms[] = $tokens[$i];
+        }
+    }
 
     // Reverse, unique, reverse back - keeps last occurrence of duplicates
-    $deduplicated = array_reverse(array_unique(array_reverse($tokens)));
+    $deduplicated = array_reverse(array_unique(array_reverse($atoms)));
 
     return implode(' ', $deduplicated);
 }
diff --git a/src/globals/patch/spc_fix_avx512_cache_before_80400.patch‎ b/src/globals/patch/spc_fix_avx512_cache_before_80400.patch
similarity index 100%
rename from src/globals/patch/spc_fix_avx512_cache_before_80400.patch‎
rename to src/globals/patch/spc_fix_avx512_cache_before_80400.patch