fix xproj target

gyp/mbgl-core.gypi

@@ -48,6 +48,10 @@
     {
       'target_name': 'mbgl-standalone',
       'type': 'none',
+      'hard_dependency': 1,
+      'dependencies': [
+          'mbgl-core'
+      ],
       'variables': {
         'core_lib':'<(PRODUCT_DIR)/libmbgl-core.a',
         'standalone_lib':'<(PRODUCT_DIR)/libmbgl.a'

macosx/mapboxgl-app.gyp

@@ -35,18 +35,25 @@
         'MACOSX_DEPLOYMENT_TARGET':'10.9',
         'CLANG_ENABLE_OBJC_ARC': 'YES'
       },
-      'libraries': [
-        '<@(glfw3_static_libs)',
-      ],
-      'libraries': [
-        '-L<(PRODUCT_DIR)/',
-        '-lmbgl',
-        '<@(png_ldflags)',
-        '<@(sqlite3_ldflags)',
-        '<@(glfw3_static_libs)',
-        '<@(glfw3_ldflags)',
-        '<@(curl_ldflags)',
-        '<@(zlib_ldflags)',
+      'variables' : {
+        'ldflags': [
+          '-L<(PRODUCT_DIR)/',
+          '-lmbgl',
+          '<@(sqlite3_ldflags)',
+          '<@(glfw3_static_libs)',
+          '<@(glfw3_ldflags)',
+          '<@(curl_ldflags)',
+          '<@(png_ldflags)'
+        ]
+      },
+      'conditions': [
+        ['OS == "mac"', {
+          'xcode_settings': {
+            'OTHER_LDFLAGS': [ '<@(ldflags)' ],
+          }
+        }, {
+          'ldflags': [ '<@(ldflags)' ],
+        }]
       ],
       'dependencies': [
         '../mapboxgl.gyp:bundle_styles',