diff --git a/doc/top/Makefile b/doc/top/Makefile
index fa5ee63cb..a572b6d34 100644
--- a/doc/top/Makefile
+++ b/doc/top/Makefile
@@ -1,6 +1,11 @@
-top.f:
-	refer -sA+T -l4,2 -p refs.top top.n | nroff -ms > top.f
-top.f.35:
-	refer -sA+T -l4,2 -p refs.top top.n | nroff -ms -Thr35 > top.f.35
-top.f.agfa:
-	refer -sA+T -l4,2 -p refs.top top.n | nroff -ms -Tlp > top.f.agfa
+# $Header$
+
+MS=-ms
+NROFF=nroff
+REFER=refer
+TBL=tbl
+SUF=pr
+
+../top.$(SUF):	top.n refs.top
+		$(REFER) -sA+T -l4,2 -p refs.top top.n | $(TBL) | \
+			$(NROFF) $(MS) > $@