underquoting issue in pkg.m4 with autoconf-2.66+

Tue Aug 10 12:09:06 PDT 2010

Hi

Since updating to autoconf-2.66+ a lot of packages that use pkg.m4
have been failing with errors of the form:

configure:12439: error: possibly undefined macro: AS_MESSAGE_LOG_FDdnl
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.

This appears to be underquoting issue in pkg.m4 that autoconf-2.66+ is
exposing. The attached patch, which was proposed by Ralf Wildenhues
(on the autoconf mailing list) fixes this for me.

Cheers

Adam
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