diff --git a/math/mprime/Makefile b/math/mprime/Makefile
index 2c09ddc71f6e..6b4458a42fd9 100644
--- a/math/mprime/Makefile
+++ b/math/mprime/Makefile
@@ -18,15 +18,11 @@ ONLY_FOR_ARCHS=	i386
 NO_BUILD=	yes
 NO_WRKSUBDIR=	yes
 
+SUB_FILES=	pkg-message wrapper.sh
+
 # source code version
 SOURCE_VERSION=	24.14
 
-post-patch:
-# prepare wrapper
-	@${SED} \
-		-e 's|%%PREFIX%%|${PREFIX}|' ${FILESDIR}/wrapper.sh > \
-		${WRKDIR}/wrapper.sh
-
 do-install:
 	@${INSTALL_PROGRAM} ${WRKSRC}/mprime ${PREFIX}/bin/mprime-real
 	@${INSTALL_SCRIPT} ${WRKDIR}/wrapper.sh ${PREFIX}/bin/mprime
@@ -36,6 +32,8 @@ do-install:
 .endif
 
 post-install:
-	@${SED} -e 's|/usr/local/|${PREFIX}/|' ${PKGMESSAGE}
+.if !defined(NOPORTDOCS)
+	@${CAT} ${PKGMESSAGE}
+.endif
 
 .include <bsd.port.mk>
diff --git a/math/mprime/pkg-message b/math/mprime/files/pkg-message.in
similarity index 78%
rename from math/mprime/pkg-message
rename to math/mprime/files/pkg-message.in
index 3c0c8b1aed04..46a39c0949cd 100644
--- a/math/mprime/pkg-message
+++ b/math/mprime/files/pkg-message.in
@@ -1,10 +1,10 @@
 	ATTENTIONATTENTION:
 
 Please, make sure that you read
-/usr/local/share/doc/mprime/license.txt
+%%DOCSDIR%%/license.txt
 and agree to the licensing terms before running this application.
 
 Furthermore, read
-/usr/local/share/doc/mprime/readme.txt
+%%DOCSDIR%%/readme.txt
 It contains important information about both configuring and running
 mprime.  You will have problems running it if you do not read it.
diff --git a/math/mprime/files/wrapper.sh b/math/mprime/files/wrapper.sh.in
similarity index 100%
rename from math/mprime/files/wrapper.sh
rename to math/mprime/files/wrapper.sh.in