Fix installing into PREFIX.

Makefile

@@ -17,5 +17,5 @@ include ${MK}/subdir.mk
 include ${MK}/dist.mk
 
 _installafter:
-	${INSTALL} -d ${DESTDIR}${RC_LIB}/init.d
-	${INSTALL} -d ${DESTDIR}${RC_LIB}/tmp
+	${INSTALL} -d ${DESTDIR}/${PREFIX}/${RC_LIB}/init.d
+	${INSTALL} -d ${DESTDIR}/${PREFIX}/${RC_LIB}/tmp

mk/sys.mk

@@ -7,7 +7,10 @@ INSTALL?=		install
 RANLIB?=		ranlib
 SH=			/bin/sh
 
-PREFIX=			
+PREFIX?=	
+_UPREFIX_SH=		case "${PREFIX}" in "") echo /usr;; *) echo "${PREFIX}";; esac
+_UPREFIX!=		${_UPREFIX_SH}
+UPREFIX=		${_UPREFIX}$(shell ${_UPREFIX_SH})
 PKG_PREFIX=		/usr/local
 
 PICFLAG?=		-fPIC
@@ -15,18 +18,18 @@ PICFLAG?=		-fPIC
 BINDIR?=		${PREFIX}/sbin
 BINMODE?=		0755
 
-INCDIR?=		${PREFIX}/usr/include
+INCDIR?=		${UPREFIX}/include
 INCMODE?=		0444
 
 LIBNAME?=		lib
-LIBDIR?=		${PREFIX}/usr/${LIBNAME}
+LIBDIR?=		${UPREFIX}/${LIBNAME}
 LIBMODE?=		0444
 SHLIBDIR?=		${PREFIX}/${LIBNAME}
 
-MANDIR?=		${PREFIX}/usr/share/man/man
+MANDIR?=		${UPREFIX}/share/man/man
 MANMODE?=		0444
 
-DOCDIR?=		${PREFIX}/usr/share/doc
+DOCDIR?=		${UPREFIX}/share/doc
 DOCMODE?=		0644	
 
 CONFMODE?=		0644

runlevels/Makefile

@@ -2,7 +2,7 @@ BOOT=		bootmisc fsck hostname localmount \
 		root swap sysctl urandom
 DEFAULT=	local netmount
 
-LEVELDIR=	${DESTDIR}/etc/runlevels
+LEVELDIR=	${DESTDIR}/${PREFIX}/etc/runlevels
 BOOTDIR=	${LEVELDIR}/boot
 DEFAULTDIR=	${LEVELDIR}/default
 

sh/Makefile

@@ -11,7 +11,7 @@ include Makefile.${SUBOS}
 include ${MK}/scripts.mk
 
 _installafter:
-	${INSTALL} -d ${DESTDIR}/etc/init.d
+	${INSTALL} -d ${DESTDIR}/${PREFIX}/etc/init.d
 	@# Provide an init script for the loopback interface
 	ln -snf ${RC_LIB}/sh/net.sh ${DESTDIR}/${PREFIX}/etc/init.d/${NET_LO} || exit $$?
 	@# Put functions.sh into the init.d dir so 3rd party apps don't have to