build: begin making gyp file work on unix

binding.gyp

@@ -1,7 +1,6 @@
 {
   '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': [
     {
@@ -17,14 +16,18 @@
         'src/init.cc',
         'src/PixelArray.cc',
       ],
+      'conditions': [
+        ['OS=="win"', {
           'libraries': ['-l<(GTK_Root)/lib/cairo.lib' ],
           'include_dirs': [
-		   '<(GTK_Root)/include/cairo',
+            '<(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;