On 11 Nov, John-Mark Bell <jmb(a)netsurf-browser.org&gt; wrote: Ok, that's good to know for the next time. In this case there were only a few files so it was ok. Yes, "penciltest" was probably a confusing name. I expected that pencil_build will be compiled and saved as a file called penciltest. I did not confuse it with pencil_test. But I was not aware that you have to use two source files together to build one library file. (You do not have to explain. If I use C more often then I am sure I can read this in every C book). With your help I was able to build both the library and test binary without problems and ended up with a draw file. So for me my problem is solved now! Thank you very much! Michael