diff --git a/config/ext.json b/config/ext.json
index 3134ab7bb..d4f8e6ce1 100644
--- a/config/ext.json
+++ b/config/ext.json
@@ -235,6 +235,18 @@
         ],
         "lib-depends-windows": []
     },
+    "gmagick": {
+        "support": {
+            "Windows": "wip",
+            "BSD": "wip"
+        },
+        "type": "external",
+        "source": "ext-gmagick",
+        "arg-type": "custom",
+        "lib-depends": [
+            "graphicsmagick"
+        ]
+    },
     "gmp": {
         "support": {
             "Windows": "wip",
diff --git a/config/lib.json b/config/lib.json
index 17258b771..41307ab40 100644
--- a/config/lib.json
+++ b/config/lib.json
@@ -197,6 +197,27 @@
             "Security"
         ]
     },
+    "graphicsmagick": {
+        "source": "graphicsmagick",
+        "pkg-configs": [
+            "GraphicsMagick",
+            "GraphicsMagickWand"
+        ],
+        "lib-depends": [
+            "zlib",
+            "libpng",
+            "libjpeg",
+            "bzip2",
+            "libxml2"
+        ],
+        "lib-suggests": [
+            "libwebp",
+            "libtiff",
+            "freetype",
+            "zstd",
+            "xz"
+        ]
+    },
     "grpc": {
         "source": "grpc",
         "pkg-configs": [
diff --git a/config/source.json b/config/source.json
index d7224d4d6..c7c298db2 100644
--- a/config/source.json
+++ b/config/source.json
@@ -171,6 +171,16 @@
             "path": "LICENSE"
         }
     },
+    "ext-gmagick": {
+        "type": "url",
+        "url": "https://pecl.php.net/get/gmagick",
+        "path": "php-src/ext/gmagick",
+        "filename": "gmagick.tgz",
+        "license": {
+            "type": "file",
+            "path": "LICENSE"
+        }
+    },
     "ext-gmssl": {
         "type": "ghtar",
         "repo": "gmssl/GmSSL-PHP",
@@ -401,6 +411,14 @@
             "path": "LICENSE"
         }
     },
+    "graphicsmagick": {
+        "type": "url",
+        "url": "https://downloads.sourceforge.net/project/graphicsmagick/graphicsmagick/1.3.46/GraphicsMagick-1.3.46.tar.xz",
+        "license": {
+            "type": "file",
+            "path": "Copyright.txt"
+        }
+    },
     "grpc": {
         "type": "git",
         "rev": "v1.75.x",
diff --git a/src/SPC/builder/extension/gmagick.php b/src/SPC/builder/extension/gmagick.php
new file mode 100644
index 000000000..9be1f158d
--- /dev/null
+++ b/src/SPC/builder/extension/gmagick.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\extension;
+
+use SPC\builder\Extension;
+use SPC\store\FileSystem;
+use SPC\util\CustomExt;
+
+#[CustomExt('gmagick')]
+class gmagick extends Extension
+{
+    public function patchBeforeBuildconf(): bool
+    {
+        // PHP 8.5 removed zend_exception_get_default(), use zend_ce_exception instead
+        FileSystem::replaceFileStr($this->source_dir . '/gmagick.c', 'zend_exception_get_default()', 'zend_ce_exception');
+
+        // Remove the entire OpenMP check block from config.m4 to avoid linking
+        // against libgomp in static builds. gmagick's config.m4 uses PHP_CHECK_FUNC
+        // which does not honour ac_cv cache variables, so we must patch the source.
+        FileSystem::replaceFileRegex(
+            SOURCE_PATH . '/php-src/ext/gmagick/config.m4',
+            '/AC_MSG_CHECKING\(omp_pause_resource_all usability\).*?AC_MSG_RESULT\(no\)\n\t\t\]\)/s',
+            'dnl OMP check removed for static build'
+        );
+        return true;
+    }
+
+    public function getUnixConfigureArg(bool $shared = false): string
+    {
+        return '--with-gmagick=' . ($shared ? 'shared,' : '') . BUILD_ROOT_PATH;
+    }
+}
diff --git a/src/SPC/builder/linux/library/graphicsmagick.php b/src/SPC/builder/linux/library/graphicsmagick.php
new file mode 100644
index 000000000..abbd549c1
--- /dev/null
+++ b/src/SPC/builder/linux/library/graphicsmagick.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\linux\library;
+
+class graphicsmagick extends LinuxLibraryBase
+{
+    use \SPC\builder\unix\library\graphicsmagick;
+
+    public const NAME = 'graphicsmagick';
+}
diff --git a/src/SPC/builder/macos/library/graphicsmagick.php b/src/SPC/builder/macos/library/graphicsmagick.php
new file mode 100644
index 000000000..3d697e67e
--- /dev/null
+++ b/src/SPC/builder/macos/library/graphicsmagick.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\macos\library;
+
+class graphicsmagick extends MacOSLibraryBase
+{
+    use \SPC\builder\unix\library\graphicsmagick;
+
+    public const NAME = 'graphicsmagick';
+}
diff --git a/src/SPC/builder/unix/library/graphicsmagick.php b/src/SPC/builder/unix/library/graphicsmagick.php
new file mode 100644
index 000000000..869fcd400
--- /dev/null
+++ b/src/SPC/builder/unix/library/graphicsmagick.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\unix\library;
+
+use SPC\util\executor\UnixAutoconfExecutor;
+use SPC\util\SPCTarget;
+
+trait graphicsmagick
+{
+    protected function build(): void
+    {
+        $ac = UnixAutoconfExecutor::create($this)
+            ->optionalLib('zlib', ...ac_with_args('zlib'))
+            ->optionalLib('libpng', ...ac_with_args('png'))
+            ->optionalLib('libjpeg', ...ac_with_args('jpeg'))
+            ->optionalLib('libwebp', ...ac_with_args('webp'))
+            ->optionalLib('libtiff', ...ac_with_args('tiff'))
+            ->optionalLib('freetype', ...ac_with_args('ttf'))
+            ->optionalLib('bzip2', ...ac_with_args('bzlib'))
+            ->addConfigureArgs(
+                '--disable-openmp',
+                '--without-x',
+                '--without-perl',
+                // HEIF/JXL: GraphicsMagick auto-detects libheif/libjxl from the
+                // buildroot but the API versions are often incompatible (e.g.
+                // GM 1.3.46 expects libheif symbols added in 2.4+). Exclude them
+                // to avoid compile errors. Neither format is needed for typical
+                // WordPress/web image processing (JPEG/PNG/WebP/GIF suffice).
+                '--without-heif',
+                '--without-jxl',
+                '--enable-shared=no',
+                '--enable-static=yes',
+            );
+
+        // special: linux-static target needs `-static`
+        $ldflags = SPCTarget::isStatic() ? '-static -ldl' : '-ldl';
+
+        // special: macOS needs -liconv
+        $libs = SPCTarget::getTargetOS() === 'Darwin' ? '-liconv' : '';
+
+        $ac->appendEnv([
+            'LDFLAGS' => $ldflags,
+            'LIBS' => $libs,
+            'PKG_CONFIG' => '$PKG_CONFIG --static',
+        ]);
+
+        $ac->configure()->make();
+
+        $this->patchPkgconfPrefix(['GraphicsMagick.pc', 'GraphicsMagick++.pc', 'GraphicsMagickWand.pc']);
+        $this->patchLaDependencyPrefix();
+    }
+}
diff --git a/src/globals/ext-tests/gmagick.php b/src/globals/ext-tests/gmagick.php
new file mode 100644
index 000000000..aa98ff510
--- /dev/null
+++ b/src/globals/ext-tests/gmagick.php
@@ -0,0 +1,7 @@
+<?php
+
+declare(strict_types=1);
+
+assert(class_exists('Gmagick'));
+assert(in_array('JPEG', (new Gmagick())->queryformats()));
+assert(in_array('PNG', (new Gmagick())->queryformats()));
diff --git a/src/globals/test-extensions.php b/src/globals/test-extensions.php
index cbcecb0ee..f7a106a92 100644
--- a/src/globals/test-extensions.php
+++ b/src/globals/test-extensions.php
@@ -43,15 +43,16 @@
 $upx = false;
 
 // whether to test frankenphp build, only available for macOS and linux
-$frankenphp = false;
+$frankenphp = true;
 
 // prefer downloading pre-built packages to speed up the build process
 $prefer_pre_built = false;
 
 // If you want to test your added extensions and libs, add below (comma separated, example `bcmath,openssl`).
 $extensions = match (PHP_OS_FAMILY) {
-    'Linux', 'Darwin' => 'decimal',
-    'Windows' => 'decimal',
+    'Linux' => 'gmagick',
+    'Darwin' => 'gmagick',
+    'Windows' => 'gmagick',
 };
 
 // If you want to test shared extensions, add them below (comma separated, example `bcmath,openssl`).
@@ -66,7 +67,7 @@
 
 // If you want to test extra libs for extensions, add them below (comma separated, example `libwebp,libavif`). Unnecessary, when $with_suggested_libs is true.
 $with_libs = match (PHP_OS_FAMILY) {
-    'Linux', 'Darwin' => 'krb5',
+    'Linux', 'Darwin' => '',
     'Windows' => '',
 };