Hello, I downloaded and installed Picolisp 32 bits on mac os 10.6. Everything went all right. Then I tried to install the library for openGL and I had to modify the makefile to build a 32 bits lib. **********DYNAMIC-LIB-FLAGS = -m32 -dynamiclib -undefined dynamic_lookup -framework OpenGL -framework GLUT********** I do not believe the -framework OpenGL is required, but it may be cleaner