Index: lua-5.3.4/src/luaconf.h
===================================================================
--- lua-5.3.4/src/luaconf.h
+++ lua-5.3.4/src/luaconf.h	2018-04-04 21:02:50.018693915 +0200
@@ -187,6 +187,7 @@
 */
 #define LUA_LDIR	"!\\lua\\"
 #define LUA_CDIR	"!\\"
+#define LUA_CDIR64	LUA_ROOT "lib64/lua/" LUA_VDIR
 #define LUA_SHRDIR	"!\\..\\share\\lua\\" LUA_VDIR "\\"
 #define LUA_PATH_DEFAULT  \
 		LUA_LDIR"?.lua;"  LUA_LDIR"?\\init.lua;" \
@@ -203,12 +204,14 @@
 #define LUA_ROOT	"/usr/"
 #define LUA_LDIR	LUA_ROOT "share/lua/" LUA_VDIR "/"
 #define LUA_CDIR	LUA_ROOT "lib/lua/" LUA_VDIR "/"
+#define LUA_CDIR64	LUA_ROOT "lib64/lua/" LUA_VDIR "/"
 #define LUA_PATH_DEFAULT  \
 		LUA_LDIR"?.lua;"  LUA_LDIR"?/init.lua;" \
 		LUA_CDIR"?.lua;"  LUA_CDIR"?/init.lua;" \
-		"./?.lua;" "./?/init.lua"
+		LUA_CDIR64"?.lua;" LUA_CDIR64"?/init.lua;" "./?.lua;" "./?/init.lua"
 #define LUA_CPATH_DEFAULT \
-		LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so"
+		LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" \
+		LUA_CDIR64"?.so;" LUA_CDIR64"loadall.so;" "./?.so"
 #endif			/* } */