[vermaden]

True, I just tested them and they fail with ccache, but there is bery simple sollution for them. for every port that fails you may add something like that to /etc/make.conf as ohauer suggested:

.if !defined(NO_CACHE)
  CC=  /usr/local/libexec/ccache/world-cc
  CCX= /usr/local/libexec/ccache/world-cc++
.endif

.if ${.CURDIR:M*/ports/games/freera}
  NO_CCACHE= yes
.endif

And you are done with that one.

You may even do something like that if you feel more comfortable:

CCACHE_DISABLED+= games/freera \
                  graphics/gsculpt \
                  devel/ccache

.for PORT in ${CCACHE_DISABLED}
.if ${.CURDIR:M*/ports/$(PORT)}
  NO_CCACHE= yes
.endif
.endfor