Make include in makefiles be relative to the file's location

Question

Directly related to this question. How can I make the include directive in makefiles behave relatively to the location of the current script?

Assume tha

Answer 1

Is there a builtin variable with the current makefile's name?

Yes, there is, use ${CURDIR}. This is the directory where top-level Makefile is located, so you don't need to strip anything from it.

http://www.gnu.org/software/make/manual/make.html#Recursion