Hi.
Well, I can do my work like this, but still it is not really clear why:
1. the same library (eg. the same version) is not working in the normal debian (read "default") setup?
You have to distinguish between using a library for running a program and using a library (and its headers) for compiling a program. For compiling you need also libgsl0-dev. apt-get install build-essential g77 libgsl0-dev After that I was able to compile getdp-1.0.1. $ ls -l /usr/lib/libgsl.* -rw-r--r-- 1 root root 3600118 2005-04-11 01:17 /usr/lib/libgsl.a lrwxrwxrwx 1 root root 15 2005-08-18 16:31 /usr/lib/libgsl.so -> libgsl.so.0.7.0 lrwxrwxrwx 1 root root 15 2005-08-18 16:31 /usr/lib/libgsl.so.0 -> libgsl.so.0.7.0 -rw-r--r-- 1 root root 1738768 2005-04-11 01:17 /usr/lib/libgsl.so.0.7.0 Regards Petr