You can find more information about the library on the website:

http://www.fixscript.org/

To use in your project, simply copy these files to your project:

fiximage.c
fiximage.h
macros.fix
classes.fix
image/

Compile with these flags:
-msse2 -mstackrealign

On Linux you need to link against these libraries:
-lm -lrt -lpthread

On Mac OS X you need to link against these libraries:
-lm -lpthread
