Compile C99 compliant .so on Windows

Question

I'm using the StarRuby (https://github.com/hajimehoshi/starruby) library and am attempting to compile the latest version to a .so file for linking in my ruby project.

However, after acquiring the needed libraries for compilation, and running the extconf.rb file to make the Makefile, I find that the C code does not comply to the C90 format, and more than like requires the C99 format.

This is a problem because mingw does not use C99, and I am stuck on Windows.

How can I compile the above source code into a .so for requiring in ruby on Windows?

The makefile: http://pastebin.com/raw.php?i=i2ANc82g
The exact output of the makefile can be found here: http://pastebin.com/raw.php?i=VpbmyLgy
Since rolling back to libpng 1.2: http://pastebin.com/raw.php?i=TqdeADHY

Answer 1

Add this line to your Makefile:

$CFLAGS += " -std=c99"