Ccache 2.4 - Compiler Cache.

Ccache is a compiler cache. It acts as a caching pre-processor to C/C++ compilers, using the -E compiler switch and a hash to detect when a compilation can be satisfied from cache. This often results in a 5 to 10 times speedup in common compilations.

To enable ccache's default use, the system admin should modify /etc/sysconfig/ccache to "yes". If its default use is not enabled and you wish to use it, simply add /usr/lib/ccache/bin/ to the start of your $PATH.