Patch upstream luarocks-2.0.13 for parallel Lua interpreter installations per http://lua-users.org/wiki/LuaRocksConfig

luarocks-2.0-homebrew.diff

diff --git a/Makefile b/Makefile
index 67c3ce0..2d149c7 100644
--- a/Makefile
+++ b/Makefile
@@ -81,8 +81,13 @@
 	for f in $(BIN_FILES) ;\
 	do \
 	   sed "1d" src/bin/$$f > src/bin/$$f.bak ;\
-	   echo "#!$(LUA_BINDIR)/lua$(LUA_SUFFIX)" > src/bin/$$f ;\
-	   echo "package.path = [[$(LUADIR)/?.lua;$(LUADIR)/?/init.lua;]]..package.path" >> src/bin/$$f ;\
+	   printf '%s\n' \
+	      '#!/bin/sh' \
+	      'SH=--[[' \
+	      'exec "$${LUA-$(LUA_BINDIR)/lua$(LUA_SUFFIX)}" "$$0" $${1+"$$@"}' \
+	      ']]SH' \
+	      'package.path = [[$(LUADIR)/?.lua;$(LUADIR)/?/init.lua;]]..package.path' \
+	   > src/bin/$$f ;\
 	   cat src/bin/$$f.bak >> src/bin/$$f ;\
 	   chmod +x src/bin/$$f ;\
 	   rm -f src/bin/$$f.bak ;\