Fix USE_CBACKTRACE

[metaconfig.git] / U / perl / usebacktrace.U

diff --git a/U/perl/usebacktrace.U b/U/perl/usebacktrace.U
index 5fa5b3a..dc9447b 100644 (file)
--- a/U/perl/usebacktrace.U
+++ b/U/perl/usebacktrace.U
@@ -20,11 +20,11 @@
 ?C:.
 ?H:#$usecbacktrace USE_CBACKTRACE              /**/
 ?H:.
-?D:usecbacktrace=''
 ?LINT:extern ccflags
 ?LINT:change ccflags
 : add flags if using c backtrace
 case "$usecbacktrace" in
+  "") usecbacktrace=$undef ;;
   [yY]*|true|$define)
     case "$d_backtrace" in
       [yY]*|true|$define)