Make does not deal with backslashes very well at all. This is discussed
already in the README.W32 file, etc.
It is a known issue but one for which there is no trivial solution:
backslashes in UNIX (and make) typically are escape characters.
I will give you the same advice that the README files,
This is a known deficiency in current versions of GNU make: only the
first target-specific pattern will match a given target, not all of
them.
This will be fixed in the next version of GNU make. If you check the
archives of this mailing list, you will find patches submitted to
address this.
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