On 2017-12-04 17:14, Laurent Tassan-Got wrote: > Just consider the simple C program tstl.c [snip] > The compilation with the command > gcc -Wall -O2 -o tstl.exe tstl.c > is successful and the execution as well. > > Now the compilation with: > gcc -Wall -O2 -o tstl.exe -I /usr/include/X11 tstl.c > fails with the following messages:
-I/usr/include/X11 is incorrect, regardless of case (in)sensitivity. X11 headers are namespaced, meaning that you should e.g. #include <X11/Xlib.h> instead of <Xlib.h>. If your code doesn't do that, then you need to fix it. -- Yaakov
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