Use 'pkg-config' instead of heuristics to find 'tk' flags.

--- matplotlib-1.4.3/setupext.py.orig	2015-12-01 14:21:19.554417453 +0100
+++ matplotlib-1.4.3/setupext.py	2015-12-02 10:39:47.282363530 +0100
@@ -1457,7 +1457,7 @@
             p = subprocess.Popen(
                 '. %s ; eval echo ${%s}' % (file, varname),
                 shell=True,
-                executable="/bin/sh",
+                executable="sh",
                 stdout=subprocess.PIPE)
             result = p.communicate()[0]
             return result.decode('ascii')
@@ -1601,8 +1601,19 @@
             #      of distros.
 
             # Query Tcl/Tk system for library paths and version string
+            def getoutput(s):
+                ret = os.popen(s).read().strip()
+                return ret
             try:
-                tcl_lib_dir, tk_lib_dir, tk_ver = self.query_tcltk()
+                pkg_config_libs = getoutput('pkg-config --libs-only-L tk').split()
+                # drop '-L' part of strings
+                pkg_config_libs = [s[2:] for s in pkg_config_libs]
+                pkg_config_ver = getoutput('pkg-config --modversion tk')
+                tk_ver = re.match(r"(\d+.\d+)[\d.]*", pkg_config_ver).group(1)
+                tcl_lib_dir = next(s for s in pkg_config_libs
+                                   if re.match(r".*-tcl-.*", s)) + '/tcl' + tk_ver
+                tk_lib_dir = next(s for s in pkg_config_libs
+                                  if re.match(r".*-tk-.*", s)) + '/tk' + tk_ver
             except:
                 tk_ver = ''
                 result = self.hardcoded_tcl_config()
x/log/doc/he-config-bare-bones.scm'>
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<div class='path'>path: <a href='/guix/log/?id=fa75b73501c9cc5daeabecccae2fe6d3a81adf3b'>root</a>/<a href='/guix/log/doc?id=fa75b73501c9cc5daeabecccae2fe6d3a81adf3b'>doc</a>/<a href='/guix/log/doc/he-config-bare-bones.scm?id=fa75b73501c9cc5daeabecccae2fe6d3a81adf3b'>he-config-bare-bones.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/doc/he-config-bare-bones.scm?id=fa75b73501c9cc5daeabecccae2fe6d3a81adf3b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-06-10 22:42:49 +0200'>2022-06-10</span></td><td><a href='/guix/commit/doc/he-config-bare-bones.scm?id=d859d8873ceb3c591210968cfd4c88e26fc89edc'>doc: Update example of a minimalistic home environment.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/he-config-bare-bones.scm: Adujst example according to changes in
bash-service-type and home-files-service-type.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Andrew Tropin</td></tr>
<tr><td><span title='2021-10-09 19:24:18 +0300'>2021-10-09</span></td><td><a href='/guix/commit/doc/he-config-bare-bones.scm?id=0e8d2df0f1a4ab25c482e1c427c54e19903e62f3'>Move (gnu home-services) to (gnu home services).</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/home-services.scm (%guix-home-root-directory): Replace
gnu/home-services.scm with "gnu/home/services.scm".
Rename to gnu/home/services.scm.
* gnu/local.mk
(GNU_SYSTEM_MODULES): Rename gnu/home-services.scm to gnu/home/services.scm.
* doc/he-config-bare-bones.scm:
Replace (gnu home-services) with (gnu home services).
* gnu/home.scm: Same.
* gnu/home/services/fontutils.scm: Same.
* gnu/home/services/mcron.scm: Same.
* gnu/home/services/shells.scm: Same.
* gnu/home/services/shepherd.scm: Same.
* gnu/home/services/symlink-manager.scm: Same.
* gnu/home/services/xdg.scm: Same.
* guix/scripts/home.scm: Same.
* guix/self.scm: Same.
</span></span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2021-10-08 15:36:18 +0300'>2021-10-08</span></td><td><a href='/guix/commit/doc/he-config-bare-bones.scm?id=ba8ddb348045f81f061a1c7f51c0f7c2b0024e71'>gnu: Move (gnu home-services) to (gnu home services).</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/home-services/configuration.scm: Move the content ...
* gnu/home/services/configuration.scm: ... here.
* doc/guix.texi:
Replace (gnu home-services mcron) with (gnu home services mcron).
Replace (gnu home-services) with (gnu home services).
* gnu/home.scm:
Replace (gnu home-services fontutils) with (gnu services fontutils).
Replace (gnu home-services shells) with (gnu home services shells).
Replace (gnu home-services symlink-manager) with
(gnu home services symlink-manager).
Replace (gnu home-services xdg) with (gnu home services xdg).
* gnu/home-services/fontutils.scm: Rename to gnu/services/fontutils.scm.
* gnu/home-services/mcron.scm: Move to gnu/home/services/mcron.scm.
Replace (gnu home-services shepherd) with (gnu home services shepherd).
* gnu/home-services.scm (%service-type-path):
Search home services in "gnu/services".
* gnu/home-services/shells.scm: Replace (gnu home-services configuration) with
(gnu home services configuration).
Rename to gnu/home/services/shells.scm.
Replace (gnu home-services utils) with (gnu home services utils).
* gnu/home-services/shepherd.scm: Move to gnu/home/services/shepherd.scm.
* gnu/home-services/symlink-manager.scm:
Rename to gnu/home/services/symlink-manager.scm.
* gnu/home-services/utils.scm: Rename to gnu/home/services/utils.scm.
* gnu/home-services/xdg.scm: Rename to gnu/home/services/xdg.scm.
* guix/scripts/home/import.scm:
Replace (gnu home-services bash) with (gnu home services bash).
* gnu/home-services.scm: Update documentation string.
* doc/he-config-bare-bones.scm:
Apply new (gnu home-services ...) modules location.
* gnu/local.mk (GNU_SYSTEM_MODULES): Same.
</span></span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2021-09-09 20:26:51 +0300'>2021-09-09</span></td><td><a href='/guix/commit/doc/he-config-bare-bones.scm?id=aaffa43c1752e062934580f55616e0380963a1be'>doc: Add Guix Home documentation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/guix.texi: Add Guix Home documentation.
* doc/he-config-bare-bones.scm: New file.

Signed-off-by: Oleg Pykhalov &lt;go.wigust@gmail.com&gt;
</span></span></td><td>Andrew Tropin</td></tr>