On Fri, 9 Jun 2006, Ben Hoefer wrote: "[..] Yesterday I tried to compile my 1st ADA programm "Hello World!". Unfortunately, I got the following error message: gnatmake -PC:/GNAT/bin/helloworld.gpr helloworld.adb -d fatal error, run-time library not installed correctly cannot locate file system.ads gnatmake: *** make failed. process exited with status 4 Well, when I installed GNAT / GPS I affirmed the options suggested by the programm (for instance the folders ...) So, if the run-time library is not installed correctly - I can't help it: GNAT / GPS did install this library! I deinstalled GNAT / GSP, and I installed it again. I tried to compile my little program again. And I got the same error message. So, what can I do to make this strange GNAT / GPS compiler work? I would appreciate any hints, suggestions and recomendations." I suspect that what is needed has been installed but that a poor setup is hindering easily sompiling. Please search for the file system.ads and report to us its full path. After finding it, please type the command set in the DOS command box in which you would invoke gnatmake and send a copy of the output (environment variables' settings) so that we could suggest modifications such as adding the path you found to GCC's (and hence GNAT's) include (cf. specification) path enviornment variable CPATH (which is not restricted to C).