[PATCH] Append srcprefix to $INCFLAGS in create_makefile

Hi all,

The following patch automatically appends the srcprefix to the $INCFLAGS 
in the create_makefile method.

My reasoning is that I often put private .h files in the same directory 
as the main files. These typically contain helper functions that I don't 
want to include in the main source. I don't think I'm alone in this, so 
I'd be curious to have some feedback.

If it turns out that I'm the only one who does this then I'll just 
manually append it myself in the extconf.rb file.

Regards,

Dan

--- mkmf.orig   Fri Feb  1 14:52:45 2008
+++ mkmf.rb     Fri Feb  1 14:59:46 2008
@@ -1231,7 +1231,8 @@
  # directory as your build script. This will not only eliminate the 
need for
  # you to manually copy the source files into the same directory as 
your build
  # script, but it also sets the proper +target_prefix+ in the generated
-# Makefile.
+# Makefile. In addition, the +srcprefix+ will be appended to the list of
+# $INCFLAGS if set.
  #
  # Setting the +target_prefix+ will, in turn, install the generated 
binary in
  # a directory under your Config::CONFIG['sitearchdir'] that mimics 
your local
@@ -1277,6 +1278,8 @@
      target_prefix = ""
    end

+  $INCFLAGS += " -I#{srcprefix}" if srcprefix
+
    srcprefix ||= '$(srcdir)'
    Config::expand(srcdir = srcprefix.dup)