Index: share/mk/src.sys.env.mk
===================================================================
--- share/mk/src.sys.env.mk
+++ share/mk/src.sys.env.mk
@@ -28,3 +28,13 @@
 MAKESYSPATH:= ${MAKESYSPATH:S,.../share/mk,${.PARSEDIR:tA},}
 .export MAKESYSPATH
 .endif
+
+.if defined(WITH_CCACHE_BUILD) && !defined(NOCCACHE) && \
+    ${PATH:M*ccache*} == "" && (!defined(CC) || ${CC:M*ccache*} == "")
+LOCALBASE?=	/usr/local
+CCACHE_PATH?=	${LOCALBASE}/libexec/ccache/world
+.if exists(${CCACHE_PATH})
+PATH:=	${CCACHE_PATH}:${PATH}
+.export PATH
+.endif
+.endif