fontforge: fix carbon header paths, close Homebrew/homebrew#10572

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Find the developer prefix and use that, like MaPorts
- @adamv

Formula/fontforge.rb

@@ -1,11 +1,12 @@
 require 'formula'
 
 class Fontforge < Formula
-  url 'http://downloads.sourceforge.net/project/fontforge/fontforge-source/fontforge_full-20110222.tar.bz2'
-  head 'git://fontforge.git.sourceforge.net/gitroot/fontforge/fontforge'
   homepage 'http://fontforge.sourceforge.net'
+  url 'http://downloads.sourceforge.net/project/fontforge/fontforge-source/fontforge_full-20110222.tar.bz2'
   md5 '5be4dda345b5d73a27cc399df96e463a'
 
+  head 'git://fontforge.git.sourceforge.net/gitroot/fontforge/fontforge'
+
   depends_on 'pkg-config' => :build
   depends_on 'gettext'
   depends_on 'pango'
@@ -21,7 +22,10 @@ class Fontforge < Formula
   end
 
   def install
-    args = ["--prefix=#{prefix}", "--enable-double", "--without-freetype-bytecode"]
+    args = ["--prefix=#{prefix}",
+            "--enable-double",
+            "--without-freetype-bytecode"]
+
     args << "--without-python" if ARGV.include? "--without-python"
 
     ENV.x11
@@ -35,6 +39,14 @@ class Fontforge < Formula
       s.gsub! "ln -s /usr/local/bin/fontforge", "ln -s $(bindir)/fontforge"
     end
 
+    # Fix hard-coded include file paths. Reported usptream:
+    # http://sourceforge.net/mailarchive/forum.php?thread_name=C1A32103-A62D-468B-AD8A-A8E0E7126AA5%40smparkes.net&forum_name=fontforge-devel
+    # https://trac.macports.org/ticket/33284
+    header_prefix = MacOS.xcode_prefix
+    inreplace %w(fontforge/macbinary.c fontforge/startui.c gutils/giomime.c) do |s|
+      s.gsub! "/Developer", header_prefix
+    end
+
     system "make"
     system "make install"
   end