using realpath/abspath in 3.81

[Krzysztof Nosek]

Dear list,

I've noticed that both realpath and abspath functions take only relative 
paths as their arguments. With absolute path they break it, trying to make 
it absolute:

$ make --version
GNU Make 3.81
...
$ make -f -
$(info $(realpath d:/temp))
^Z
c:/progs/cygwin/home/nosek/d:/temp

I've tried it with:
 * Cygwin's make,
 * GnuWin32 binary release make,
 * make.exe built with MSVC++ from 3.81 sources.

I don't know if it's a win32 specific problem, or a general make 3.81 
"feature" (or just lack of feature).

Thanks for any help,
Krzysztof Nosek