diff -up man-1.6f/src/makewhatis.sh.update man-1.6f/src/makewhatis.sh
--- man-1.6f/src/makewhatis.sh.update	2009-04-19 22:01:26.900609474 +0200
+++ man-1.6f/src/makewhatis.sh	2009-04-19 22:06:46.690612151 +0200
@@ -35,6 +35,8 @@
 # 060608 - Corrected traps.
 # 060719 - section choosing behavior to match man's (Mike frysinger).
 #
+# 090419 - Add -U flag, Lubomir Rintel <lkundrak@v3.sk>
+#
 # Note for Slackware users: "makewhatis -v -w -c" will work.
 #
 # makewhatis flc 060719 (from @version@)
@@ -121,6 +123,9 @@ case $name in
 	continue;;
     -o) setwhatis=1
         continue;;
+    -U) [ -f "$whatisdb" ] && findarg="-cnewer $whatisdb"
+	update=1
+	continue;;
     -u) findarg="-ctime 0"
 	update=1
 	continue;;
@@ -133,7 +138,8 @@ case $name in
 	echo "       This will build the whatis database for the man pages"
 	echo "       found in manpath and the cat pages found in catpath."
         echo "       -s: sections (default: $sections)"
-	echo "       -u: update database with new pages"
+	echo "       -u: update database with pages added today"
+	echo "       -U: update database with pages added since last makewhatis run"
 	echo "       -v: verbose"
         echo "       -o: location of whatis database (default: $DEFWHATIS)"
 	echo "       -w: use manpath obtained from \`man --path\`"