Get Python LDFLAGS from 'pkg-config'.

The other approach is more complex and gets it wrong: it returns
"-L/path/to/python/lib/python-2.7.10/lib/python2.7/config -lpython -lwhatever";
since that config/ sub-directory contains libpython2.7.a, we end up
statically linking Python in Weechat's python.so, which we do not want.

--- weechat-1.3/configure.ac	2015-08-16 08:27:07.000000000 +0200
+++ weechat-1.3/configure.ac	2015-11-29 18:18:52.975197048 +0100
@@ -535,29 +535,7 @@ if test "x$enable_python" = "xyes" ; the
             if test -r "$PYTHON_INCLUDE/Python.h"; then
                 PYTHON_CFLAGS="-I$PYTHON_INCLUDE"
                 AC_MSG_RESULT(found)
-                PYTHON_LIB=`$PYTHON -c "import sys, distutils.sysconfig; sys.stdout.write(distutils.sysconfig.get_config_var('LIBPL'))"`
-                PYTHON_LFLAGS="-lpython$PYTHON_VERSION "`$PYTHON -c "import sys, distutils.sysconfig; sys.stdout.write(distutils.sysconfig.get_config_var('LIBS')+' '+distutils.sysconfig.get_config_var('SYSLIBS')+' '+distutils.sysconfig.get_config_var('LINKFORSHARED'))"`
-                AC_MSG_CHECKING(for Python library)
-                if test -r "$PYTHON_LIB/libpython$PYTHON_VERSION.so"; then
-                   PYTHON_LFLAGS="-L$PYTHON_LIB $PYTHON_LFLAGS"
-                   AC_MSG_RESULT(found)
-                elif test -r "$PYTHON_LIB/libpython$PYTHON_VERSION.a"; then
-                   PYTHON_LFLAGS="-L$PYTHON_LIB $PYTHON_LFLAGS"
-                   AC_MSG_RESULT(found)
-                elif test -r "$PYTHON_LIB/libpython$PYTHON_VERSION.dll.a"; then
-                   PYTHON_LFLAGS="-L$PYTHON_LIB $PYTHON_LFLAGS"
-                   AC_MSG_RESULT(found)
-                elif test -r "$PYTHON_SYSPREFIX/lib/libpython$PYTHON_VERSION.so"; then
-                   PYTHON_LFLAGS="-L$PYTHON_SYSPREFIX/lib/ $PYTHON_LFLAGS"
-                   AC_MSG_RESULT(found)
-                else
-                    AC_MSG_WARN([
-*** Python library couldn't be found on your system.
-*** Try to install it with your software package manager.
-*** WeeChat will be built without Python support.])
-                    enable_python="no"
-                    not_found="$not_found python"
-                fi
+                PYTHON_LFLAGS=`pkg-config python2 --libs`
             else
                 AC_MSG_WARN([
 *** Python header files couldn't be found on your system.
id=6a19dd1e219df886f83f846b5532fe7e56f874ee&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-10-01 08:58:06 +0000'>2021-10-01</span></td><td><a href='/guix/commit/nix/local.mk?id=8579304e8f4deaca33b816b2d56af1d814a03bde'>build: Don’t delete ‘guix-gc.timer’ file.</a><span class='msg-avail'>...<span class='msg-tooltip'>Without this invoking ‘make clean’ would remove ‘guix-gc.timer’, and ‘make’
would fail with.

  make[2]: *** No rule to make target 'etc/guix-gc.timer', needed by 'all-am'.  Stop.

* nix/local.mk (nodist_systemdservice_DATA): Remove ‘guix-gc.timer’.
</span></span></td><td>Xinglu Chen</td></tr>
<tr><td><span title='2021-09-20 14:18:21 +0000'>2021-09-20</span></td><td><a href='/guix/commit/nix/local.mk?id=5c4fd77097e2cecfd4780e099af7954f86779fe1'>etc: Add systemd files for running ‘guix gc’ periodically</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-gc.service.in: New file.
* etc/guix-gc.timer: Likewise.
* .gitignore: Ignore generated ‘guix-gc.service’.
* nix/local.mk (nodist_systemdservice_DATA): Add ‘guix-gc.service’ and
‘guix-gc.timer’.
(EXTRA_DIST): Add ‘guix-gc.service.in’ and ‘guix-gc.timer’.
* doc/guix.texi (Binary Installation): Mention the new systemd files.

Signed-off-by: Mathieu Othacehe &lt;othacehe@gnu.org&gt;
</span></span></td><td>Thiago Jung Bauermann</td></tr>
<tr><td><span title='2021-03-30 10:29:33 +0300'>2021-03-30</span></td><td><a href='/guix/commit/nix/local.mk?id=aed51ecea87f9b5045cc888cd1d9653a27813164'>gnu: guix: Fix openrc init scripts.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/46871&gt;.

* gnu/packages/package-management.scm (guix)[arguments]: Fix openrc init.
* nix/local.mk (openrcservicedir): Likewise.

Signed-off-by: Efraim Flashner &lt;efraim@flashner.co.il&gt;
</span></span></td><td>zimoun</td></tr>