Jerzy> [...] I don't have any 'libgsl.so' or 'libgsl.a' in Jerzy> /usr/local/lib. Can you give me examples of what could I have Jerzy> done wrong?
I just did your exact steps (on ubuntu 18.04 in this case; I'll try it later on my debian and red hat systems): download, ./configure; make -j; make install) and when I type: $ find /usr/local -name '*gsl*so*' I get this: $ find /usr/local -name '*gsl*.so*' /usr/local/lib/libgslcblas.so.0 /usr/local/lib/libgsl.so /usr/local/lib/libgsl.so.23 /usr/local/lib/libgslcblas.so.0.0.0 /usr/local/lib/libgslcblas.so /usr/local/lib/libgsl.so.23.1.0 $ Could you run find /usr/local -name '*gsl*.so*' on your system and send that to me? Also can you report if the "make install" step exited cleanly or with an error status? One way to find out is to look carefully at the output; another is to type echo $? first thing *immediately* after the "make install". You could also run: ./configure make -j YOUR_NUMBER_OF_CORES make install 2>&1 | tee makei.out and send me your makei.out file.