--- sys/unix/Makefile.doc.orig	2019-05-13 11:17:47.677796575 -0500
+++ sys/unix/Makefile.doc	2019-05-13 11:22:38.045441807 -0500
@@ -28,12 +28,13 @@
 
 # Use the "cat" GUIDECMD if nroff and/or tbl and/or col are not installed
 # Not appropriate for creating Guidebook.txt.
-# GUIDECMD = cat Guidebook.txt
+GUIDECMD = cat Guidebook.txt
 #
 # 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)
+#GUIDECMD = $(GUIDE_PREFORMAT) | nroff -c -Tascii | $(COLCMD)
+GUIDECMD = tbl tmac.n Guidebook.mn | nroff | $(COLCMD)
 
 # Only generate output for the current configuration:
 NHGREP = $(MAKEDEFS) --grep --input - --output -