tools/editors/emacs/tests/Makefile has the following shebang:
#!/usr/bin/env make
However, this doesn't quite work:
$ cd tools/editors/emacs/tests/
$ chmod +x Makefile
$ ./Makefile
make: Nothing to be done for `Makefile'.
I propose to remove the shebang completely.
Of course it works. The message of `make` is a clear indication for that.
May be you meant to say `./Makefile tests`.