diff --git a/sys/unix/Makefile.doc b/sys/unix/Makefile.doc
index a2f09094f..89b67a12e 100644
--- a/sys/unix/Makefile.doc
+++ b/sys/unix/Makefile.doc
@@ -33,8 +33,8 @@ PSCMD = groff
 # Single page. Might need adjustment to .pl value
 # GUIDECMD= $(GUIDE_PREFORMAT) | perl -pe 's/^(.mt)$$/.pl 4720v\n.in 0\n.po 8\n.ll 64m\n$$1/' | nroff -c -Tascii | $(COLCMD)
 #
-GUIDECMD = $(GUIDE_PREFORMAT) | nroff -c -Tascii | $(COLCMD)
-ONEPAGECMD = $(ONEPAGE_PREFORMAT) | nroff -c -Tascii | $(COLCMD) \
+GUIDECMD = $(GUIDE_PREFORMAT) | nroff -c -Tascii $(NROFF_FLAGS) | $(COLCMD)
+ONEPAGECMD = $(ONEPAGE_PREFORMAT) | nroff -c -Tascii $(NROFF_FLAGS) | $(COLCMD) \
 	| sed -e '/EOF--EOF/,12345D'
 
 # Only generate output for the current configuration:
diff --git a/sys/unix/hints/linux.370 b/sys/unix/hints/linux.370
index 4cc403dcf..301aee237 100755
--- a/sys/unix/hints/linux.370
+++ b/sys/unix/hints/linux.370
@@ -336,6 +336,10 @@ CHGRP=true
 VARDIRPERM = 0755
 VARFILEPERM = 0600
 GAMEPERM = 0755
+
+# suppress several hundred warnings with recent *roff
+NROFF_FLAGS = -W font
+
 #
 #-INCLUDE cross-pre.370
 #