You need a c++ compiler. This should be part of the gcc distribution. If
you just want a working compiled plug-in, I got a working compile (lots of
people have been having trouble getting their c++ compilers working right)
and put it on my website at:
http://virgo.umeche.maine.edu/gimp/binaries/
I also put homogenizer in the same directory as it is also written in c++,
and people may have trouble getting it to compile as well.
If you want a permenant fix, you can download the full gcc distribution at
ftp://ftp.freesoftware.com/pub/sourceware/gcc/releases/
but first make sure you are using the latest glibc as well.
-James Smaby