There's no ifdef for STARTUP.
Index: Makefile
===================================================================
RCS file: /cvs/src/usr.bin/mg/Makefile,v
retrieving revision 1.28
diff -u -p -r1.28 Makefile
--- Makefile 31 May 2013 18:03:43 -0000 1.28
+++ Makefile 4 Jan 2015 19:08:47 -0000
@@ -9,7 +9,7 @@ DPADD+= ${LIBCURSES} ${LIBUTIL}
#
# FKEYS -- add support for function key sequences.
# REGEX -- create regular expression functions.
-# STARTUP -- look for and handle initialization file.
+# STARTUPFILE -- look for and handle initialization file.
# XKEYS -- use termcap function key definitions.
# note: XKEYS and bsmap mode do _not_ get along.
#
