Increase minimum cmake version to 2.8.5
Increase minimum cmake version to 2.8.5

The GNUInstallDirs script is not available in versions of CMake before
2.8.5.  Increase the minimum required version to 2.8.5 to ensure
GNUInstallDirs availability.

hsu/fcl,mamoll/fcl,hsu/fcl,mamoll/fcl,hsu/fcl,mamoll/fcl