Description: GCC 11 now enforces that comparison objects be invocable as const.
--- a/Rendering/Label/vtkLabelHierarchy.cxx
+++ b/Rendering/Label/vtkLabelHierarchy.cxx
@@ -525,1 +525,1 @@
-                    const vtkHierarchyNode & b)
+                    const vtkHierarchyNode & b) const
--- a/Rendering/Label/vtkLabelHierarchyPrivate.h
+++ b/Rendering/Label/vtkLabelHierarchyPrivate.h
@@ -66,1 +66,1 @@
-    bool operator () ( const vtkIdType& a, const vtkIdType& b )
+    bool operator () ( const vtkIdType& a, const vtkIdType& b ) const
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<tr><td><span title='2023-07-18 00:41:15 +0200'>2023-07-18</span></td><td><a href='/guix/commit/doc/environment-gdb.scm?id=602e32c8e0e36d149e1424d8023a214abd3d34ba'>doc: Update GDB "guix shell" example to use autoconf-2.69</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/environment-gdb.scm: Change to use autoconf-2.69.
* gnu/packages/autotools.scm: Remove outdated GDB comment.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>fanquake</td></tr>
<tr><td><span title='2022-01-14 22:39:24 +0100'>2022-01-14</span></td><td><a href='/guix/commit/doc/environment-gdb.scm?id=b0aab0f255556c8c5027e3ad11bfc7826bb1f609'>doc: Update "guix shell -D -f" example to new input style.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/environment-gdb.scm: Change to use 'modify-inputs'.
</span></span></td><td>Ludovic Courtès</td></tr>