[Haskell-cafe] Glut using freeglut and non starndard header / lib location?

Which is the way to install the glut library with non standard header / lib location? I've tried setting CFLAGS before running ./configure ./setup configure and adding the include directory this way include-dirs: include, /nix/store/rz4nfm5qcrjrk0jsr1lxnjwamgxmgip8-freeglut-2.4.0/include All results in checking for GL/glut.h... (cached) no checking GLUT/glut.h usability... no checking GLUT/glut.h presence... no checking for GLUT/glut.h... no configure: error: no GLUT header found, so this package cannot be built The configure script is meant to be run by cabal only? Marc