By default, in a cross-build sbuild sets DEB_BUILD_OPTIONS=nocheck
and DEB_BUILD_PROFILES='cross nocheck'.

Using the --profiles option replaces rather than adding to this
default value of DEB_BUILD_PROFILES.  I don't like that but I can
accept it as a reasonable choice.

However, it also disables the addition to DEB_BUILD_OPTIONS.  This is
surprising and doesn't seem to be documented in any way.  This happens
even if 'nocheck' is included in the --profiles option argument.

(dh seems to have a workaround that automatically adds the missing
'nocheck' to DEB_BUILD_OPTIONS if it is found in DEB_BUILD_PROFILES.
But packages that do not or cannot use dh, such as linux, are still
affected by this.)

Ben.