This patch hard-codes the Tk library directory during package initialization.

See <http://core.tcl.tk/tk/tktview/765642ffffffffffffff>.

diff --git a/generic/tkWindow.c b/generic/tkWindow.c
index b5cbbab..96b5501 100644
--- a/generic/tkWindow.c
+++ b/generic/tkWindow.c
@@ -988,6 +988,7 @@ TkCreateMainWindow(
 
     Tcl_SetVar2(interp, "tk_patchLevel", NULL, TK_PATCH_LEVEL, TCL_GLOBAL_ONLY);
     Tcl_SetVar2(interp, "tk_version",    NULL, TK_VERSION,     TCL_GLOBAL_ONLY);
+    Tcl_SetVar2(interp, "tk_library",    NULL, TK_LIBRARY,     TCL_GLOBAL_ONLY);
 
     tsdPtr->numMainWindows++;
     return tkwin;
diff --git a/unix/Makefile.in b/unix/Makefile.in
index f21fdbb..c61b0df 100644
--- a/unix/Makefile.in
+++ b/unix/Makefile.in
@@ -1029,7 +1029,7 @@ tkVisual.o: $(GENERIC_DIR)/tkVisual.c
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tkVisual.c
 
 tkWindow.o: $(GENERIC_DIR)/tkWindow.c
-	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tkWindow.c
+	$(CC) -c $(CC_SWITCHES) -DTK_LIBRARY=\"${TK_LIBRARY}\" $(GENERIC_DIR)/tkWindow.c
 
 tkButton.o: $(GENERIC_DIR)/tkButton.c
 	$(CC) -c $(CC_SWITCHES) $(GENERIC_DIR)/tkButton.c
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<div class='path'>path: <a href='/guix/log/?id=612d6a8e5b65774cbebf5b26515ffa9fbba57507'>root</a>/<a href='/guix/log/gnu?id=612d6a8e5b65774cbebf5b26515ffa9fbba57507'>gnu</a>/<a href='/guix/log/gnu/system?id=612d6a8e5b65774cbebf5b26515ffa9fbba57507'>system</a>/<a href='/guix/log/gnu/system/file-systems.scm?id=612d6a8e5b65774cbebf5b26515ffa9fbba57507'>file-systems.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/gnu/system/file-systems.scm?id=612d6a8e5b65774cbebf5b26515ffa9fbba57507&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-11-04 23:35:32 +0100'>2019-11-04</span></td><td><a href='/guix/commit/gnu/system/file-systems.scm?id=625bdf09d344302ec2d5da7f35fe35ca1d128a93'>file-systems: Mount /var/run/nscd read-write in containers.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/37967&gt;.
Reported by Ivan Vilata i Balaguer &lt;ivan@selidor.net&gt;.

* gnu/system/file-systems.scm (%network-file-mappings): Set 'writable?'
to #true for /var/run/nscd.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-12 23:07:42 +0200'>2019-09-12</span></td><td><a href='/guix/commit/gnu/system/file-systems.scm?id=5ccec77176b7e0c67ed58c8849e5e76f3dd79a88'>file-systems: Add /var/run/nscd to '%network-file-mappings'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This allows containers created by "guix environment -CN" or by
"guix system container -N" to talk to the host nscd.

* gnu/system/file-systems.scm (%network-file-mappings): Add
"/var/run/nscd".
* gnu/build/shepherd.scm (default-mounts)[nscd-socket]: Remove.
* gnu/system/linux-container.scm (container-script)[nscd-run-directory]
[nscd-mapping, nscd-os, nscd-specs]: Remove.
[script]: Filter out from SPECS bind-mounts where the device does not
exist.
* guix/scripts/environment.scm (launch-environment/container)
[optional-mapping-&gt;fs]: New procedure.
[mappings]: Remove %NETWORK-FILE-MAPPINGS.
[file-systems]: Add %NETWORK-FILE-MAPPINGS here, filtered through
'optional-mapping-&gt;fs'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-07-19 11:53:47 +0200'>2019-07-19</span></td><td><a href='/guix/commit/gnu/system/file-systems.scm?id=b41c7beb0b5b7a16656d6acf53f77eaf2a58e125'>file-systems: Use 'no-atime' for %IMMUTABLE-STORE.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/file-systems.scm (%immutable-store): Add 'no-atime'.
</span></span></td><td>Ludovic Courtès</td></tr>