diff --git a/src/SPC/builder/Extension.php b/src/SPC/builder/Extension.php
index 6b56f4e4..12175cee 100644
--- a/src/SPC/builder/Extension.php
+++ b/src/SPC/builder/Extension.php
@@ -539,11 +539,15 @@ class Extension
         [$staticLibs, $sharedLibs] = $this->splitLibsIntoStaticAndShared($config['libs']);
         $preStatic = PHP_OS_FAMILY === 'Darwin' ? '' : '-Wl,--start-group ';
         $postStatic = PHP_OS_FAMILY === 'Darwin' ? '' : ' -Wl,--end-group ';
+        $extraLd = trim((string) getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS'));
+        if (PHP_OS_FAMILY !== 'Darwin') {
+            $extraLd = trim($extraLd . ' -Wl,-Bsymbolic');
+        }
         return [
             'CFLAGS' => $config['cflags'],
             'CXXFLAGS' => $config['cflags'],
             'LDFLAGS' => $config['ldflags'],
-            'EXTRA_LDFLAGS' => getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS'),
+            'EXTRA_LDFLAGS' => $extraLd,
             'LIBS' => clean_spaces("{$preStatic} {$staticLibs} {$postStatic} {$sharedLibs}"),
             'LD_LIBRARY_PATH' => BUILD_LIB_PATH,
         ];
@@ -588,7 +592,7 @@ class Extension
      *                of static library flags, and the second is a space-separated string
      *                of shared library flags
      */
-    protected function splitLibsIntoStaticAndShared(string $allLibs): array
+    protected function splitLibsIntoStaticAndShared(string $allLibs, array $excludeFromStatic = []): array
     {
         $staticLibString = '';
         $sharedLibString = '';
@@ -598,6 +602,16 @@ class Extension
             if (str_starts_with($lib, BUILD_LIB_PATH . '/lib') && str_ends_with($lib, '.a')) {
                 $staticLib = $lib;
             }
+            // Libs in $excludeFromStatic are statically linked into php-cli already and re-export their
+            // symbols; including them as static archives in a shared extension creates a second in-process
+            // copy of the same library (e.g. libssl/libcrypto), causing duplicated atexit handlers and
+            // shared-state corruption (NULL engine_lock at exit). Drop them here so the shared extension's
+            // undefined refs resolve at runtime against php-cli's exported symbols instead.
+            $libName = str_starts_with($lib, '-l') ? substr($lib, 2) : basename($lib, '.a');
+            $libName = str_starts_with($libName, 'lib') ? substr($libName, 3) : $libName;
+            if (in_array($libName, $excludeFromStatic, true)) {
+                continue;
+            }
             if ($lib === '-lphp' || !file_exists($staticLib)) {
                 $sharedLibString .= " {$lib}";
             } else {
diff --git a/src/SPC/builder/extension/opcache.php b/src/SPC/builder/extension/opcache.php
index cc1dfcc1..ec7e70db 100644
--- a/src/SPC/builder/extension/opcache.php
+++ b/src/SPC/builder/extension/opcache.php
@@ -58,7 +58,10 @@ class opcache extends Extension
         ) {
             $opcache_jit = ' --disable-opcache-jit';
         }
-        return '--enable-opcache' . ($shared ? '=shared' : '') . $opcache_jit;
+        if ($phpVersionID < 80500) {
+            return '--enable-opcache' . ($shared ? '=shared' : '') . $opcache_jit;
+        }
+        return trim($opcache_jit);
     }
 
     public function getDistName(): string
diff --git a/src/SPC/builder/unix/library/liblz4.php b/src/SPC/builder/unix/library/liblz4.php
index 2dc2b46f..6815fce6 100644
--- a/src/SPC/builder/unix/library/liblz4.php
+++ b/src/SPC/builder/unix/library/liblz4.php
@@ -12,6 +12,13 @@ trait liblz4
     {
         // disable executables
         FileSystem::replaceFileStr($this->source_dir . '/programs/Makefile', 'install: lz4', "install: lz4\n\ninstallewfwef: lz4");
+        // zig-cc / clang -flto -c with multiple input files only produces an .o for the first source,
+        // leaving liblz4.a with just lz4.o. Compile sources individually so all .o files exist.
+        FileSystem::replaceFileStr(
+            $this->source_dir . '/lib/Makefile',
+            "liblz4.a: \$(SRCFILES)\nifeq (\$(BUILD_STATIC),yes)  # can be disabled on command line\n\t@echo compiling static library\n\t\$(COMPILE.c) \$^\n\t\$(AR) rcs \$@ *.o\nendif",
+            "liblz4.a: \$(SRCFILES:.c=.o)\nifeq (\$(BUILD_STATIC),yes)  # can be disabled on command line\n\t@echo compiling static library\n\t\$(AR) rcs \$@ \$^\nendif"
+        );
         return true;
     }
 
@@ -28,7 +35,7 @@ trait liblz4
 
         $this->patchPkgconfPrefix(['liblz4.pc']);
 
-        foreach (FileSystem::scanDirFiles(BUILD_ROOT_PATH . '/lib/', false, true) as $filename) {
+        foreach (FileSystem::scanDirFiles(BUILD_LIB_PATH . '/', false, true) as $filename) {
             if (str_starts_with($filename, 'liblz4') && (str_contains($filename, '.so') || str_ends_with($filename, '.dylib'))) {
                 unlink(BUILD_ROOT_PATH . '/lib/' . $filename);
             }