cmus: add flac CFLAGS detection patch

This could fix issue 5555:
https://github.com/mxcl/homebrew/issues/5555

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

Formula/cmus.rb

@@ -17,8 +17,33 @@ class Cmus < Formula
   skip_clean 'bin/cmus'
   skip_clean 'bin/cmus-remote'
 
+  def patches
+    # fix flac CFLAGS detection, already applied upstream:
+    # https://gitorious.org/cmus/cmus/commit/51f7aaccab09f30ff6a683eec3163904c7148cb3
+    DATA
+  end
+
   def install
     system "./configure", "prefix=#{prefix}", "mandir=#{man}"
     system "make install"
   end
 end
+__END__
+diff --git a/configure b/configure
+index 127f64a..e8fbece 100755
+--- a/configure
++++ b/configure
+@@ -146,7 +146,12 @@ check_mpc()
+ 
+ check_flac()
+ {
+-	pkg_config FLAC "flac" "" "-lFLAC -lm" && return 0
++	if pkg_config FLAC "flac" "" "-lFLAC -lm"
++	then
++		# Make sure the FLAC_CFLAGS value is sane, strip trailing '/FLAC'.
++		FLAC_CFLAGS=`echo $FLAC_CFLAGS | sed "s/FLAC$//"`
++		return 0
++	fi
+ 	check_library FLAC "" "-lFLAC -lvorbisfile -lm"
+ 	return $?
+ }