ccache
本家 http://ccache.samba.org/
日本語 http://hp.vector.co.jp/authors/VA013651/freeSoftware/ccache_ja.html
- ports/devel/ccache で make install
- /etc/make.conf に以下を追加
.if !defined(NOCCACHE) CC=/usr/local/libexec/ccache/cc CXX=/usr/local/libexec/ccache/c++ .endif