Can't build ruby20 on -current: it doesn't honor WITHOUT_CDDL=yes

[Andrey Chernov]

Hi.
I disable zfs and dtrace on my machine using WITHOUT_CDDL=yes in
/etc/src.conf
ryby20 port throw this error:
...
checking for valgrind/memcheck.h... no
checking for strip... strip
configure: error: dtrace(1) is missing
===>  Script "configure" failed unexpectedly.

I see you have sophisticated check depending on OS version for
CONFIGURE_ARGS+=        --enable-dtrace
IMHO, it should be replaced to test dtrace binary presence instead.

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