find proto for missing identifiers

games/dungeon-crawl/patches/patch-source_effects_cc

@@ -0,0 +1,12 @@
+$OpenBSD: patch-source_effects_cc,v 1.1 2017/05/01 21:00:15 espie Exp $
+Index: source/effects.cc
+--- source/effects.cc.orig
++++ source/effects.cc
+@@ -13,6 +13,7 @@
+ 
+ #include <string.h>
+ #include <stdio.h>
++#include <stdlib.h>
+ 
+ #include "externs.h"
+ 

games/dungeon-crawl/patches/patch-source_it_use3_cc

@@ -0,0 +1,12 @@
+$OpenBSD: patch-source_it_use3_cc,v 1.1 2017/05/01 21:00:15 espie Exp $
+Index: source/it_use3.cc
+--- source/it_use3.cc.orig
++++ source/it_use3.cc
+@@ -15,6 +15,7 @@
+ #include "it_use3.h"
+ 
+ #include <string.h>
++#include <stdlib.h>
+ 
+ #include "externs.h"
+ 

games/dungeon-crawl/patches/patch-source_randart_cc

@@ -0,0 +1,12 @@
+$OpenBSD: patch-source_randart_cc,v 1.1 2017/05/01 21:00:15 espie Exp $
+Index: source/randart.cc
+--- source/randart.cc.orig
++++ source/randart.cc
+@@ -17,6 +17,7 @@
+ 
+ #include <string.h>
+ #include <stdio.h>
++#include <stdlib.h>
+ 
+ #include "externs.h"
+ #include "itemname.h"

games/dungeon-crawl/patches/patch-source_tags_cc

@@ -0,0 +1,12 @@
+$OpenBSD: patch-source_tags_cc,v 1.1 2017/05/01 21:00:15 espie Exp $
+Index: source/tags.cc
+--- source/tags.cc.orig
++++ source/tags.cc
+@@ -55,6 +55,7 @@
+ 
+ #include <stdio.h>
+ #include <string.h>            // for memcpy
++#include <stdlib.h>
+ 
+ #ifdef LINUX
+ #include <sys/types.h>