/usr/share/aclocal/purple.m4 is in libpurple-dev 1:2.12.0-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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dnl # Configure paths for libpurple
dnl # Gary Kramlich 2005
dnl #
dnl # Based off of glib-2.0.m4 by Owen Taylor
dnl ###########################################################################
dnl ###########################################################################
dnl # AM_PATH_PURPLE([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl #
dnl # Test for purple and define PURPLE_CFLAGS, PURPLE_LIBS, PURPLE_DATADIR, and
dnl # PURPLE_LIBDIR
dnl ###########################################################################
AC_DEFUN([AM_PATH_PURPLE],
[dnl
AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
no_purple=""
if test x"$PKG_CONFIG" != x"no" ; then
if $PKG_CONFIG --atleast-pkgconfig-version 0.7 ; then
:
else
echo "*** pkg-config is too old; version 0.7 or newer is required."
no_purple="yes"
PKG_CONFIG="no"
fi
else
no_purple="yes"
fi
min_version=ifelse([$1], ,2.0.0,$1)
found_version=""
AC_MSG_CHECKING(for purple - version >= $min_version)
if test x"$no_purple" = x"" ; then
PURPLE_DATADIR=`$PKG_CONFIG --variable=datadir purple`
PURPLE_LIBDIR=`$PKG_CONFIG --variable=libdir purple`
PURPLE_CFLAGS=`$PKG_CONFIG --cflags purple`
PURPLE_LIBS=`$PKG_CONFIG --libs purple`
purple_version=`$PKG_CONFIG --modversion purple`
purple_major_version=`echo $purple_version | cut -d. -f 1`
purple_minor_version=`echo $purple_version | cut -d. -f 2`
dnl # stash the micro version in a temp variable. Then stash
dnl # the numeric for it in purple_micro_version and anything
dnl # else in purple_extra_version.
purple_micro_version_temp=`echo $purple_version | cut -d. -f 3`
purple_micro_version=`echo $purple_micro_version_temp | sed 's/[[^0-9]]//g'`
purple_extra_version=`echo $purple_micro_version_temp | sed 's/[[0-9]]//g'`
dnl # get the major, minor, and macro that the user gave us
min_major_version=`echo $min_version | cut -d. -f 1`
min_minor_version=`echo $min_version | cut -d. -f 2`
min_micro_version=`echo $min_version | cut -d. -f 3`
dnl # check the users version against the version from pkg-config
if test $purple_major_version -eq $min_major_version -a \
$purple_minor_version -ge $min_minor_version -a \
$purple_micro_version -ge $min_micro_version
then
:
else
no_purple="yes"
found_version="$purple_major_version.$purple_minor_version.$purple_micro_version$purple_extra_version"
fi
dnl # Do we want a compile test here?
fi
if test x"$no_purple" = x"" ; then
AC_MSG_RESULT(yes (version $purple_major_version.$purple_minor_version.$purple_micro_version$purple_extra_version))
ifelse([$2], , :, [$2])
else
AC_MSG_RESULT(no)
if test x"$PKG_CONFIG" = x"no" ; then
echo "*** A new enough version of pkg-config was not found."
echo "*** See http://www.freedesktop.org/software/pkgconfig/"
fi
if test x"found_version" != x"" ; then
echo "*** A new enough version of purple was not found."
echo "*** You have version $found_version"
echo "*** See http://pidgin.im/"
fi
PURPLE_CFLAGS=""
PURPLE_LIBS=""
PURPLE_DATADIR=""
PURPLE_LIBDIR=""
ifelse([$3], , :, [$3])
fi
AC_SUBST(PURPLE_CFLAGS)
AC_SUBST(PURPLE_LIBS)
AC_SUBST(PURPLE_DATADIR)
AC_SUBST(PURPLE_LIBDIR)
])
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