c23 boolean conflict

when compiling libXt-1.3.0 with -std=gnu2x I get:

  CC       TMparse.lo
Shell.c: In function '_XtShellAncestorSensitive':
Shell.c:1005:20: error: expected identifier or '(' before 'true'
 1005 |     static Boolean true = True;
      |                    ^~~~
Shell.c:1008:35: error: lvalue required as unary '&' operand
 1008 |         value->addr = (XPointer) (&true);
      |                                   ^
make[3]: *** [Makefile:651: Shell.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
  CC       TMprint.lo

compiling without -std=gnu2x doesn't have this problem

This is because, as of C23, there is a new boolean type, and this redefinition of the now reserved word 'true' conflicts with the builtin/reserved word 'true' from c23

options

1. use a different word for true (this would work for both c23 and previous versions of c)
2. ifdef guard this in the case of c23

Best option honestly is just 1, because it's just a local variable, used only once.

Here's an example of what I mean, which allows for compilation using c23

--- libXt-1.3.0/src/Shell.c	2023-04-09 14:48:48.000000000 -0600
+++ fixed/src/Shell.c	2023-11-12 01:21:05.921215946 -0600
@@ -1002,10 +1002,9 @@
 static void
 _XtShellAncestorSensitive(Widget widget, int closure, XrmValue *value)
 {
-    static Boolean true = True;
-
+    static Boolean t = True;
     if (widget->core.parent == NULL)
-        value->addr = (XPointer) (&true);
+        value->addr = (XPointer) (&t);
     else
         _XtCopyFromParent(widget, closure, value);
 }