Issue #21166: Prevent possible segfaults and other random failures of
python --generate-posix-vars in pybuilddir.txt build target by ensuring
that pybuilddir.txt is always regenerated when configure is run and
that the newly built skeleton python does not inadvertently import
modules from previously installed instances.
diff --git a/configure b/configure
index 7379203..139d391 100755
--- a/configure
+++ b/configure
@@ -2950,6 +2950,9 @@
+# pybuilddir.txt will be created by --generate-posix-vars in the Makefile
+rm -f pybuilddir.txt
+
if test "$cross_compiling" = yes; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for python interpreter for cross build" >&5
$as_echo_n "checking for python interpreter for cross build... " >&6; }