On 28 December 2010 04:07, emanu wrote: > > * I have a source code in C (.c and .h -files mainly) > * This semas to have been compiled into a program with GCC originally On unix and Linux gravit probably should be compiled with gcc. The Windows version might not be intended to be compiled with gcc. The gravit source code includes a .dsp file and a .dsw file, which implies that at least some Window users compile it with Visual Studio. To find out the recommended compiler for building on Windows ask the gravit mailing list, or switch to Linux.