[Fix] I haz been told that older versions of gcc won't compile this. I say FFFFUUUUU!!

src/ai.c

@@ -1,3 +1,7 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
 #include "lauxlib.h"
 #include "lualib.h"
 

src/conf.c

@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
 #include <getopt.h>

src/land.c

@@ -1,3 +1,8 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
 #include "lephisto.h"
 #include "log.h"
 #include "toolkit.h"

src/misn_lua.c

@@ -1,3 +1,8 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
 #include "lua.h"
 #include "lauxlib.h"
 

src/opengl.c

@@ -4,9 +4,10 @@
 #include <ft2build.h>
 #include <freetype/freetype.h>
 #include <freetype/ftglyph.h>
-#include <math.h>
-#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
+#include <stdarg.h>
 
 #include "lephisto.h"
 #include "log.h"

src/physics.c

@@ -1,5 +1,6 @@
-#include <math.h>
 #include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 
 #include "lephisto.h"
 #include "log.h"

src/toolkit.c

@@ -1,3 +1,5 @@
+#include <stdarg.h>
+
 #include "lephisto.h"
 #include "log.h"
 #include "pause.h"