fix php/frankenphp#1346

Author: henderkes

src/Package/Library/gmp.php

@@ -8,6 +8,7 @@
 use StaticPHP\Attribute\Package\Library;
 use StaticPHP\Package\LibraryPackage;
 use StaticPHP\Runtime\Executor\UnixAutoconfExecutor;
+use StaticPHP\Runtime\SystemTarget;
 
 #[Library('gmp')]
 class gmp
@@ -16,10 +17,12 @@ class gmp
     #[BuildFor('Darwin')]
     public function build(LibraryPackage $lib): void
     {
-        UnixAutoconfExecutor::create($lib)
-            ->appendEnv(['CFLAGS' => '-std=c17'])
-            ->configure('--enable-fat')
-            ->make();
+        $make = UnixAutoconfExecutor::create($lib)->appendEnv(['CFLAGS' => '-std=c17']);
+        if (SystemTarget::getTargetArch() === 'x86_64' && SystemTarget::getTargetOS() === 'Linux') {
+            $libc = SystemTarget::getLibc() === 'glibc' ? 'gnu' : 'musl';
+            $make->addConfigureArgs(["--host=x86_64-pc-linux-{$libc}"]);
+        }
+        $make->configure('--enable-fat')->make();
         $lib->patchPkgconfPrefix(['gmp.pc']);
     }
 }