Re: 026fa0d5ad Breaks installs with absolue $(gitexecdir) and $(template_dir) variables using older GNU makes

A Large Angry SCM [off-list ref] writes:

The new test is also wrong; (for *nix systems) in that it really wants
to test if the first character is a '/' but GNU make doesn't have a
way to do that directly.

Hmph.  Isn't it just the matter of doing something silly like this?

ifeq ($(filter /%,$(template_dir)),)
	... it does not start with a slash
else
	... it does
endif