Index: Makefile.inc1
===================================================================
--- Makefile.inc1
+++ Makefile.inc1
@@ -557,19 +557,20 @@
 TIMENOW=	%Y%m%d%H%M%S
 EXTRA_REVISION=	.s${TIMENOW:gmtime}
 .elif ${_BRANCH:MALPHA*}
-EXTRA_REVISION= _${_BRANCH:C/-ALPHA/.a/}
+EXTRA_REVISION=	${_BRANCH:C/ALPHA([0-9]+).*/.a\1/}
 .elif ${_BRANCH:MBETA*}
-EXTRA_REVISION= _${_BRANCH:C/-BETA/.b/}
+EXTRA_REVISION=	${_BRANCH:C/BETA([0-9]+).*/.b\1/}
 .elif ${_BRANCH:MRC*}
-EXTRA_REVISION= _${_BRANCH:C/-RC/.r/}
+EXTRA_REVISION=	${_BRANCH:C/RC([0-9]+).*/.r\1/}
 .elif ${_BRANCH:MPRERELEASE*}
-EXTRA_REVISION= _${_BRANCH:C/-PRERELEASE/.p/}
-.elif ${_BRANCH:M*-p*}
-EXTRA_REVISION=	_${_BRANCH:C/.*-p([0-9]+$)/\1/}
+EXTRA_REVISION=	.p
 .endif
-PKG_VERSION=	${_REVISION}${EXTRA_REVISION}
+.if ${_BRANCH:M*-p*}
+EXTRA_REVISION+=	_${_BRANCH:C/.*-p([0-9]+$)/\1/}
 .endif
-.endif	# !defined(PKG_VERSION)
+PKG_VERSION=	${_REVISION}${EXTRA_REVISION:C/[[:space:]]//g}
+.endif
+.endif	# !defined(_MKSHOWCONFIG)
 
 .if !defined(_MKSHOWCONFIG)
 _CPUTYPE!=	MAKEFLAGS= CPUTYPE=${_TARGET_CPUTYPE} ${MAKE} -f /dev/null \