On May 28, 2012, at 03:57, I=F1aki Baz Castillo wrote:

> Hi, depending whether my Ruby C extension is being compiled on *nix or
> Windows, I need some #defines (i.e: OS_UNIX or OS_WIN).
>=20
> I see no way in MKMF documentation to generate a #define (based on
> RbConfig["host_os"] for example).

Do not use host_* values from rbconfig.rb.

Use target_* values from rbconfig.rb.

Using host_* is wrong.

The host_* values come from host that compiled ruby.  When ruby is =
cross-compiled these values won't match the target and your gem will =
fail to compile.

You should use target_* values as these values match the target ruby was =
compiled for.

See: http://sources.redhat.com/autobook/autobook/autobook_261.html=