?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)