diff --git a/gnu/usr.bin/groff/tmac/Makefile b/gnu/usr.bin/groff/tmac/Makefile
index d74f76a28c5c..b756ec0c6ae4 100644
--- a/gnu/usr.bin/groff/tmac/Makefile
+++ b/gnu/usr.bin/groff/tmac/Makefile
@@ -14,7 +14,7 @@ MLINKS=		groff_ms.7 ms.7
 MLINKS+=	groff_me.7 me.7
 MLINKS+=	groff_mdoc.7 mdoc.samples.7
 
-CLEANFILES=	${MAN} ${MDOCFILES:S/$/-s/} ${STRIPFILES:S/$/-s/} ${SPECIALFILES:S/$/-s/}
+CLEANFILES=	${MAN}
 
 NORMALFILES=	mandoc.tmac andoc.tmac an-old.tmac \
 		me.tmac \
@@ -39,45 +39,59 @@ NORMALFILES=	mandoc.tmac andoc.tmac an-old.tmac \
 		composite.tmac \
 		eqnrc \
 		troffrc troffrc-end \
+		koi8-r.tmac hyphen.ru \
 		hyphen.us hyphenex.us
+# These are all generated into the OBJDIR.
 SPECIALFILES=	an.tmac man.tmac s.tmac ms.tmac www.tmac
 STRIPFILES=	e.tmac doc.tmac mdoc.local
 MDOCFILES=	doc-common doc-ditroff doc-nroff doc-syms \
 		fr.ISO8859-1 ru.KOI8-R
+# These are in srcdir and must be built special to avoid colliding with
+# CURDIR=OBJDIR.
+SRCFILES=	fr.ISO8859-1 mdoc.local ru.KOI8-R
+CLEANFILES+=	${SRCFILES}
 
-all: ${MDOCFILES:S/$/-s/} ${STRIPFILES:S/$/-s/} ${SPECIALFILES:S/$/-s/}
+FILESGROUPS=	FILES
+FILES=		${NORMALFILES}
+FILESOWN=	${TMACOWN}
+FILESGRP=	${TMACGRP}
+FILESMODE=	${TMACMODE}
+FILESDIR=	${TMACDIR}
+MDOCFILESDIR=	${MDOCDIR}
 
-.for f in ${MDOCFILES} ${STRIPFILES}
-$f-s: $f
-	sed -f ${DIST_DIR}/strip.sed ${.ALLSRC} > ${.TARGET}
-.endfor
-
-.for f in ${SPECIALFILES}
-$f-s: $f
-	sed -e "s;@TMAC_AN_PREFIX@;${tmac_an_prefix};g" \
-	    -e "s;@TMAC_S_PREFIX@;${tmac_s_prefix};g" \
-	    -e "s;@PNMTOPS_NOSETPAGE@;pnmtops;g" \
-		${.ALLSRC} > ${.TARGET}
+# Setup handling for the generated and special file groups
+.for var in SPECIAL STRIP MDOC
+FILESGROUPS+=	${var}FILES
+CLEANFILES+=	${${var}FILES}
+${var}FILESOWN?=${TMACOWN}
+${var}FILESGRP?=${TMACGRP}
+${var}FILESMODE?=${TMACMODE}
+${var}FILESDIR?=${TMACDIR}
 .endfor
 
 beforeinstall:
-	(cd ${DIST_DIR} && \
-	    ${INSTALL} -o ${TMACOWN} -g ${TMACGRP} -m ${TMACMODE} \
-	    ${NORMALFILES} ${DESTDIR}${TMACDIR})
-	(cd ${.CURDIR} && \
-	    ${INSTALL} -o ${TMACOWN} -g ${TMACGRP} -m ${TMACMODE} \
-	    koi8-r.tmac hyphen.ru ${DESTDIR}${TMACDIR})
-.for f in ${STRIPFILES} ${SPECIALFILES}
-	${INSTALL} -o ${TMACOWN} -g ${TMACGRP} -m ${TMACMODE} \
-	    $f-s ${DESTDIR}${TMACDIR}/$f
-.endfor
-.for f in ${MDOCFILES}
-	${INSTALL} -o ${TMACOWN} -g ${TMACGRP} -m ${TMACMODE} \
-	    $f-s ${DESTDIR}${MDOCDIR}/$f
-.endfor
 .if !exists(${DESTDIR}${TMACDIR}/man.local)
 	${INSTALL} -o ${TMACOWN} -g ${TMACGRP} -m ${TMACMODE} \
 	    ${DIST_DIR}/man.local ${DESTDIR}${TMACDIR}
 .endif
 
 .include <bsd.prog.mk>
+
+# Do this after ../Makefile.inc gets included so DIST_DIR is defined.
+.for f in ${MDOCFILES} ${STRIPFILES}
+# Generate the file from the contrib dir or src dir as needed.
+.if ${SRCFILES:M${f}} != ""
+${f}: ${.CURDIR}/${f}.in
+.else
+${f}: ${DIST_DIR}/${f}
+.endif
+	sed -f ${DIST_DIR}/strip.sed ${.ALLSRC} > ${.TARGET}
+.endfor
+
+.for f in ${SPECIALFILES}
+${f}: ${DIST_DIR}/${f}
+	sed -e "s;@TMAC_AN_PREFIX@;${tmac_an_prefix};g" \
+	    -e "s;@TMAC_S_PREFIX@;${tmac_s_prefix};g" \
+	    -e "s;@PNMTOPS_NOSETPAGE@;pnmtops;g" \
+		${.ALLSRC} > ${.TARGET}
+.endfor
diff --git a/gnu/usr.bin/groff/tmac/fr.ISO8859-1 b/gnu/usr.bin/groff/tmac/fr.ISO8859-1.in
similarity index 100%
rename from gnu/usr.bin/groff/tmac/fr.ISO8859-1
rename to gnu/usr.bin/groff/tmac/fr.ISO8859-1.in
diff --git a/gnu/usr.bin/groff/tmac/mdoc.local b/gnu/usr.bin/groff/tmac/mdoc.local.in
similarity index 100%
rename from gnu/usr.bin/groff/tmac/mdoc.local
rename to gnu/usr.bin/groff/tmac/mdoc.local.in
diff --git a/gnu/usr.bin/groff/tmac/ru.KOI8-R b/gnu/usr.bin/groff/tmac/ru.KOI8-R.in
similarity index 100%
rename from gnu/usr.bin/groff/tmac/ru.KOI8-R
rename to gnu/usr.bin/groff/tmac/ru.KOI8-R.in