error with cmake gsl, fedora-15

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Hello people ! I am a beginner at this, please help !

I have installed some packages, and tested with console that they are already there and updated. I need to cmake but I get errors. It seems that there is some problem with gsl.

Here's what I get :

    -- Could NOT find GALIB (missing:  GALIB_LIBRARY GALIB_INCLUDE_DIR) 
-- GSL using pkgconfig
-- WARNING: you are using the obsolete 'PKGCONFIG' macro use FindPkgConfig
-- PKGCONFIG() indicates that gsl is not installed (install the package which contains gsl.pc if you want to support this feature)
FindGSL.cmake: gsl-config/pkg-config gsl not found. Please set it manually. GSL_CONFIG=GSL_CONFIG-NOTFOUND
CMake Error at cmake/FindGSL.cmake:174 (MESSAGE):
  GSL required, please specify it's location.
Call Stack (most recent call first):
  CMakeLists.txt:22 (find_package)


-- Configuring incomplete, errors occurred!
CMake Error: Unable to open cache file for save. /home/user/Documents/Folder/folder1/folder2/build/CMakeCache.txt
CMake Error: : System Error: Permission denied

I don't undestand what's the problem, I had done the same thing at another distribution but it seems there is some huge problem with Fedora 15. Can you please help me what I should do with this "obsolete pkgconfig package"?

I am not very familiar with linux, but I will sue it as a tool to do my work.Thank you in advance!