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Adding modified autoconf macro to a QPLed tree

[Please Cc me on replies since I'm not subscribed to d-legal]


I'm adopting the spamprobe package which is under the QPL (Qt public
license).  The package has a broken configure.in script that results
in linking against libdb3.so even when libdb4.2-dev is installed. The
previous maintainer solved this by build-depending on libdb3-dev,
while I prefer to fix configure.in.

IMHO the proper solution is to modify autoconf's AC_SEARCH_LIBS macro
and put the result into acinclude.m4 in the source tree.  Since
autoconf macros are GPLed with a special exception for generated
output, this holds for my modified version too.

vvvvv special exception from /usr/share/autoconf/autoconf/libs.m4 vvvvv
# As a special exception, the Free Software Foundation gives unlimited
# permission to copy, distribute and modify the configure scripts that
# are the output of Autoconf.  You need not follow the terms of the GNU
# General Public License when using or distributing such scripts, even
# though portions of the text of Autoconf appear in them.  The GNU
# General Public License (GPL) does govern all other use of the material
# that constitutes the Autoconf program.
# Certain portions of the Autoconf source text are designed to be copied
# (in certain cases, depending on the input) into the output of
# Autoconf.  We call these the "data" portions.  The rest of the Autoconf
# source text consists of comments plus executable code that decides which
# of the data portions to output in any given case.  We call these
# comments and executable code the "non-data" portions.  Autoconf never
# copies any of the non-data portions into its output.
# This special exception to the GPL applies to versions of Autoconf
# released by the Free Software Foundation.  When you make and
# distribute a modified version of Autoconf, you may extend this special
# exception to the GPL to apply to your modified version as well, *unless*
# your modified version has the potential to copy into its output some
# of the text that was the non-data portion of the version that you started
# with.  (In other words, unless your change moves or copies text from
# the non-data portions to the data portions.)  If your modification has
# such potential, you must delete any notice of this special exception
# to the GPL from your modified version.
^^^^^ special exception from /usr/share/autoconf/autoconf/libs.m4 ^^^^^

Now my question is:  are there any legal problems in offering upstream
the modified macro for inclusion in his source tree, which is QPLed?

. Siggy

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