Option ansi2knr mishandles sources in different directories

[Andreas Schwab]

If foo_SOURCES references sources files that are not in the current
directory then automake generate wrong dependencies with the ansi2knr
option.  For example, if Makefile.am contains:

    AUTOMAKE_OPTIONS = ansi2knr

    bin_PROGRAMS = foo
    foo_SOURCES = foobar/foo.c

then the generated Makefile.in has foo$U.o depending on foo$U.c, which
cannot be built if $U is empty.

Andreas.

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Andreas Schwab, SuSE Labs, address@hidden
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