Clarification request: AC_PREFIX_DEFAULT([.]) and AC_CONFIG_SUBDIRS collide.

[Thomas Jahns]

Hello,

I noticed having a default prefix of . causes AC_CONFIG_SUBDIRS to fail.

Is this a bug in AC_PREFIX_DEFAULT (or its documentation) or in 
AC_CONFIG_SUBDIRS?

Regards, Thomas

P.S.: the failure looks like this

....
config.status: executing depfiles commands
=== configuring in yaxt (/path/to/package_top/directory_sub)
configure: running /bin/sh ./configure --disable-option-checking '--prefix=.' 
--cache-file=/dev/null --srcdir=.
configure: error: expected an absolute directory name for --prefix: .
configure: error: ./configure failed for directory_sub

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