diff --git a/aos/build/libgcc-additions/libgcc-additions.gypi b/aos/build/libgcc-additions/libgcc-additions.gypi
new file mode 100644
index 0000000..8090f7c
--- /dev/null
+++ b/aos/build/libgcc-additions/libgcc-additions.gypi
@@ -0,0 +1,33 @@
+{
+  'targets': [
+    {
+      'target_name': 'libgcc-4.5.2',
+      'type': 'static_library',
+      'variables': {
+        'compiler-rt': '<(externals)/compiler-rt-<(compiler_rt_version)',
+      },
+      'include_dirs': [
+        '<(compiler-rt)/lib',
+      ],
+      'defines': [
+        '_YUGA_BIG_ENDIAN=1',
+        '_YUGA_LITTLE_ENDIAN=0',
+        'UINT64_C(c)=c##ULL',
+      ],
+      'sources': [
+        '<(compiler-rt)/lib/powisf2.c',
+        '<(compiler-rt)/lib/powidf2.c',
+        '<(compiler-rt)/lib/mulsc3.c',
+        '<(compiler-rt)/lib/muldc3.c',
+        '<(compiler-rt)/lib/divsc3.c',
+        '<(compiler-rt)/lib/divdc3.c',
+        #'<(compiler-rt)/lib/bswapsi2.c',
+        '_bswapsi2.o',
+        #'<(compiler-rt)/lib/bswapdi2.c',
+        '_bswapdi2.o',
+        '<(compiler-rt)/lib/floatundisf.c',
+        '<(compiler-rt)/lib/floatundidf.c',
+      ],
+    },
+  ],
+}