Updated to take lua as a parameter to make.

Makefile

@@ -1,7 +1,6 @@
 # makefile for immutable table library for Lua
+# usage: make LUA=/path/to/lua
 
-# change these to reflect your Lua installation
-LUA= /users/Bruce/Sandbox/Lua/lua-5.3.4
 LUAINC= $(LUA)/src
 LUALIB= $(LUA)/src
 LUABIN= $(LUA)/src
@@ -38,13 +37,19 @@ so:	$T
 $T:	$(OBJS)
 	$(MAKESO) -o $@ $(OBJS)
 
-$(OBJS): limmutable.c
+$(OBJS): check-lua limmutable.c
 
 clean:
-	rm -f $(OBJS) $T core core.*
+	rm -f $(OBJS) $T lua_path core core.*
 
 doc:
 	@echo "$(MYNAME) library:"
 	@fgrep '/**' $(MYLIB).c | cut -f2 -d/ | tr -d '*' | sort | column
 
+check-lua:
+	@if [ "$(LUA)" = "" ]; then \
+		echo "usage: make LUA=/path/to/lua"; \
+		exit 1; \
+	fi
+
 # eof