[CMake] find_libary

[Micha Renner]

If I use FIND_LIBRARY(_result name1), I have a strange effect, which I
do not understand.

E.g FIND_LIBRARY(_result tiff) works as it should.

FIND_LIBRARY(_result gs) fails. An inspection with nautilus shows
libgs.so is located in /usr/lib.

glib, fontconfig, pango etc. could be found.
graph, gsm, glitz-glx not. (All in /usr/lib)

What is the criteria that FIND_LIBRARY can find a library?

Micha