Index: configure.in
==================================================================
--- configure.in
+++ configure.in
@@ -117,11 +117,10 @@
 	fi
 ])
 if test "$tcltls_debug" = 'true'; then
 	AC_DEFINE(TCLEXT_TCLTLS_DEBUG, [1], [Enable debugging build])
 	AX_CHECK_COMPILE_FLAG([-fcheck-pointer-bounds], [CFLAGS="$CFLAGS -fcheck-pointer-bounds"])
-	AX_CHECK_COMPILE_FLAG([-fsanitize=undefined], [CFLAGS="$CFLAGS -fsanitize=undefined"])
 else
 	dnl If we are not doing debugging disable some of the more annoying warnings
 	AX_CHECK_COMPILE_FLAG([-Wno-unused-value], [CFLAGS="$CFLAGS -Wno-unused-value"])
 	AX_CHECK_COMPILE_FLAG([-Wno-unused-parameter], [CFLAGS="$CFLAGS -Wno-unused-parameter"])
 	AX_CHECK_COMPILE_FLAG([-Wno-deprecated-declarations], [CFLAGS="$CFLAGS -Wno-deprecated-declarations"])