diff -nruEbw -I'[$]Id:.*' ./liblua/Makefile ./liblua/Makefile
--- ./liblua/Makefile	2013-05-02 16:59:06.000000000 +0200
+++ ./liblua/Makefile	2014-01-12 15:13:44.000000000 +0100
@@ -6,8 +6,8 @@
 # Your platform. See PLATS for possible values.
 PLAT= none
 
-CC= gcc
-CFLAGS= -O2 -Wall -DLUA_COMPAT_ALL $(SYSCFLAGS) $(MYCFLAGS)
+CC?= gcc
+CFLAGS= -Wall -DLUA_COMPAT_ALL $(SYSCFLAGS) $(MYCFLAGS)
 LDFLAGS= $(SYSLDFLAGS) $(MYLDFLAGS)
 LIBS= -lm $(SYSLIBS) $(MYLIBS)
 
diff -nruEbw -I'[$]Id:.*' ./liblua/liolib.c ./liblua/liolib.c
--- ./liblua/liolib.c	2013-05-02 16:59:06.000000000 +0200
+++ ./liblua/liolib.c	2014-01-12 15:13:21.000000000 +0100
@@ -19,6 +19,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #define liolib_c
 #define LUA_LIB