Use $(wildcard) since we require gmake anyway.

Makefile

@@ -8,52 +8,7 @@
 
 MODULE = contrib
 
-SRCS =			\
-	cs_access_alias.c	\
-	cs_badwords.c		\
-	cs_fregister.c		\
-	cs_kickdots.c		\
-	cs_ping.c		\
-	cs_regmode.c		\
-	cs_regnotice.c		\
-	cs_updown.c		\
-	cs_userinfo.c		\
-	dnsbl.c		\
-	gen_echoserver.c	\
-	gen_listenerdemo.c	\
-	gen_vhostonreg.c	\
-	graphtastical.c	\
-	gs_roulette.c	\
-	ircd_announceserv.c	\
-	ircd_catserv.c	\
-	ms_fsend.c		\
-	ns_cleannick.c		\
-	ns_fenforce.c		\
-	ns_fregister.c	\
-	ns_forbid.c		\
-	ns_generatehash.c	\
-	ns_generatepass.c	\
-	ns_guestnoreg.c	\
-	ns_listlogins.c	\
-	ns_mxcheck.c		\
-	ns_mxcheck_async.c	\
-	ns_regnotice.c	\
-	ns_waitreg.c	\
-	on_db_save.c		\
-	os_akillnicklist.c	\
-	os_defcon.c	\
-	os_joinmon.c	\
-	os_kill.c		\
-	os_klinechan.c	\
-	os_modeall.c		\
-	os_pingspam.c		\
-	os_resolve.c		\
-	os_savechanmodes.c	\
-	os_tabletest.c	\
-	os_testcmd.c		\
-	os_testproc.c		\
-	os_trace.c		\
-	wumpus.c
+SRCS = $(wildcard *.c)
 
 include ../../extra.mk
 include ../../buildsys.mk

README.md

@@ -7,7 +7,10 @@ or similar cases.
 
 ### Building other modules not included in this distribution
 
-Use the `$SRCS` make variable to build and install modules.
+Just drop the file in here, and it will be built/installed.
+
+Alternatively just to build a single module, use the `$SRCS`
+make variable to build and install modules.
 
 ```
 $ make SRCS=fileyouwanttocompile.c