Changing from -lgl_s to -ldgl (as described in the 4Sight Programmer's Guide G6-13) I get the following ld errors: /usr/bin/ld: Undefined: gl_drawbitmap gl_beginstring gl_endstring *** Error code 1 Stop. compile-command: cc -o daim daim.o clsm.a -ldgl -lsun -lbsd -limage -lm -lfm_s where is the mistake ? Thanks very much for any help, Marius.