Use sections from config files rather than hardcoding.

http://bugs.gentoo.org/86863

--- src/makewhatis.sh
+++ src/makewhatis.sh
@@ -92,7 +92,15 @@
 defmanpath=$DEFMANPATH
 defcatpath=
 
-sections="1 2 3 4 5 6 7 8 9 n l"
+if [ -n "$MANSECT" ]; then
+	sections=$MANSECT
+else
+	sections=`$AWK '($1 == "MANSECT") { print $2 }' /etc/man.conf`
+	if [ x"$sections" = x ]; then
+		sections="1 2 3 4 5 6 7 8 9 n l"
+	fi
+fi
+sections=`echo $sections | sed -e 's/:/ /g'`
 
 for name in "$@"
 do