On Tue, 11 Nov 2008, Michael Gerbracht wrote: If you checked the sources out using SVN, then this should have been done automatically. This won't work, as you've discovered. You're only building one of the library source files here. pencil_test.c is the source file for the test binary. Something like: gcc -std=c99 -I<NSLibs$Dir>/include -c pencil_build.c -o pencil_build.o gcc -std=c99 -I<NSLibs$Dir>/include -c pencil_save.c -o pencil_save.o ar -cr libpencil.a pencil_build.o pencil_save.o will give you the library. And: gcc -std=c99 -I<NSLibs$Dir>/include -L<NSLibs$Dir>/lib -lOSLib32 -lrufl -o pencil_test pencil_test.c libpencil.a will give you the test binary. Alternatively, there's a pre-built libpencil in NSTools. John.