build: begin making gyp file work on unix

binding.gyp

@@ -1,30 +1,33 @@
 {
   'variables': {
-    # Set the location of GTK all-in-one bundle
-	'GTK_Root': 'C:/GTK',
+    'GTK_Root': 'C:/GTK'  # Set the location of GTK all-in-one bundle
   },
   'targets': [
     {
       'target_name': 'canvas',
       'sources': [ 
-			'src/Canvas.cc',
-			'src/CanvasGradient.cc',
-			'src/CanvasPattern.cc',
-			'src/CanvasRenderingContext2d.cc',
-			'src/color.cc',
-			'src/Image.cc',
-			'src/ImageData.cc',
-			'src/init.cc',
-			'src/PixelArray.cc',
-		],
-	  'libraries': ['-l<(GTK_Root)/lib/cairo.lib' ],
-		  'include_dirs': [
-		   '<(GTK_Root)/include/cairo',
-		  ],
-	  'defines': [
-			'snprintf=_snprintf',
-			'_USE_MATH_DEFINES' # for M_PI
-		],
+        'src/Canvas.cc',
+        'src/CanvasGradient.cc',
+        'src/CanvasPattern.cc',
+        'src/CanvasRenderingContext2d.cc',
+        'src/color.cc',
+        'src/Image.cc',
+        'src/ImageData.cc',
+        'src/init.cc',
+        'src/PixelArray.cc',
+      ],
+      'conditions': [
+        ['OS=="win"', {
+          'libraries': ['-l<(GTK_Root)/lib/cairo.lib' ],
+          'include_dirs': [
+            '<(GTK_Root)/include',
+          ],
+          'defines': [
+            'snprintf=_snprintf',
+            '_USE_MATH_DEFINES'  # for M_PI
+          ]
+        }]
+      ]
     }
   ]
 }

src/Canvas.cc

@@ -12,7 +12,7 @@
 #include <string.h>
 #include <node_buffer.h>
 #include <node_version.h>
-#include <cairo-pdf.h>
+#include <cairo/cairo-pdf.h>
 #include "closure.h"
 
 #ifdef HAVE_JPEG

src/Canvas.h

@@ -12,7 +12,7 @@
 #include <node.h>
 #include <node_object_wrap.h>
 #include <node_version.h>
-#include <cairo.h>
+#include <cairo/cairo.h>
 
 using namespace v8;
 using namespace node;