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The general usage of mkmf.rb file is typically to be something like what autoconf/automake/configure are for Linux programs--it determines appropriate compile/link options, then compiles files against them.
Typically you'd have a
require 'mkmf'
at the top of an extconf.rb file, within a gem.
The general usage is to then edit some global variables ("magic" variables), which will be used for the compile line.
# push a define:
$defs.push("-D#{name}")
# or $preload
# or $CFLAGS
# or $LDFLAGS
# etc.
and you'll possibly have to edit CONFIG['xxx'] to add more directives into the build process.
And then at the end of your extconf.rb file
create_makefile "name_of_final_lib" # the name of the .so file to create
This will create a file Makefile, which will compile all .{c,cpp} files in the current directory to .o files, then link them all together into name_of_final_lib.so
Note that within said name_of_final_lib.so file, it will have to have a method Init_filename, which will be run at load time when the .so file is first loaded.
There are more instructions here near the bottom for how to use it.
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