readline failed to build on 10.6

[foxscribe]

https://gist.github.com/foxscribe/8ca0aaf0f33644f5be95c19cd4eaeaf0

[mistydemeo]

Hmm, looks like it's trying to use a flag your compiler doesn't support. (I'd forgotten some users could be on an Xcode with no "real" GCC!) I'll see if we can convince readline not to add it.

[sevan]

Try making this change to your Library/Formula/readline.rb to sidestep the issue for now (not sure if it applies to Lion & more recent versions yet).

diff --git a/Library/Formula/readline.rb b/Library/Formula/readline.rb
index 30086d4f41..47e7235673 100644
--- a/Library/Formula/readline.rb
+++ b/Library/Formula/readline.rb
@@ -39,7 +39,7 @@ class Readline < Formula
     ENV.universal_binary
     # Since we don't set any CFLAGS, readline adds some
     # which break the build as they're not supported by GCC 4.2
-    ENV.append_to_cflags "-g -O2" if ENV.compiler == :gcc
+    ENV.append_to_cflags "-g -O2" if ENV.compiler == :gcc or MacOS.version == :snow_leopard
     system "./configure", "--prefix=#{prefix}", "--enable-multibyte"
     system "make", "install"
   end