Boehm-Demers-Weiser garbage collector formula

The Boehm-Demers-Weiser conservative garbage collector can be used as a garbage collecting
replacement for C malloc or C++ new. It allows you to allocate memory basically as you
normally would, without explicitly deallocating memory that is no longer useful. The collector
automatically recycles memory when it determines that it can no longer be otherwise accessed.

Adam Vandenberg:
    Update bdw-gc formula for 10.6

Formula/bdw-gc.rb

@@ -0,0 +1,21 @@
+require 'brewkit'
+
+class BdwGc <Formula
+  @url='http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/gc-7.1.tar.gz'
+  @homepage='http://www.hpl.hp.com/personal/Hans_Boehm/gc/'
+  @md5='2ff9924c7249ef7f736ecfe6f08f3f9b'
+
+  def install
+    if MACOS_VERSION == 10.6
+      # LLVM gives an unsupported inline asm error
+      ENV.gcc_4_2
+      
+      # ucontext has been deprecated in 10.6
+      # use this flag to force the header to compile
+      ENV['CPPFLAGS'] = ENV['CPPFLAGS'] + " -D_XOPEN_SOURCE"
+    end
+
+    system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"
+    system "make install"
+  end
+end