changing the version of the gsl

[吴奕洲]

Hi，
I have installed gsl on ubuntu14.04, but when I compile the program, it prompts 
me that lgsl is not compatible. So I need to change the version of gsl, can you 
tell me how to change the version of gsl or how to uninstall gsl completely, or 
how to solve the problem of lgsl incompatibility.I will appreciate if you can 
help me.