GSL onto postgresql server 9.2

I have to put some C-language functions onto postgresql server 9.2. These functions are used GSL software library http://www.gnu.org/software/gsl/. In Makefile for these functions I wrote LD_FLAGS = ... -lgsl, On some source-based Linux distributions such as gentoo linux these functions successfully installed onto server, but on rpm-based distributions such as fedora and others does not. gsl library has to be compiled from sources, because some specific distributions does not have this one and rpm-installation of this library does not allowed. Error message is "error <mylibrary>.so cannot load libgsl.so.0 no such file" despite of gsl library was installed onto /usr/local, library files are installed into /usr/local/lib. Where is the problem in postgresql or distribution ?
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Best regards,
Sincerely yours,
Yuriy Rusinov.