[CMake] Differentiating between FreeBSD and Linuxs

[Ajay Divekar]

I was trying to differentiate between FreeBSD and Linux's and found that by 
using CMAKE_SYSTEM_NAME variable I will be able to do that. I had 

if (CMAKE_SYSTEM_NAME MATCHES Linux)
  SET(...)
ELSE(CMAKE_SYSTEM_NAME MATCHES Linux)
  SET(...)
ENDIF(CMAKE_SYSTEM_NAME MATCHES Linux)

This works on freeBSD but fails on Fedora and SUSE. Any Solution ?

Regards,

Ajay