> Does adding:
>         .include "../../security/heimdal/buildlink3.mk"
> to the gnome-vfs2 Makefile, and 'make clean && make' help?

No - I get the same error even with this added :(

According to the PLISTs, heimdal provides lib/libgssapi.la and
include/krb5/gssapi.h, whilst mit-krb5 provides
include/gssapi/gssapi.h but only lib/libgssapi_krb5.la.  cy2-gssapi
provides lib/sasl2/libgssapiv2.la, whilst
emulators/netbsd32_compat1[56] provide
${COMPAT_LIBDIR}/libgssapi.so.0, ${COMPAT_LIBDIR}/libgssapi.so.0.4,
${COMPAT_EMULSUBDIR}/usr/lib/libgssapi.so.4, and
${COMPAT_EMULSUBDIR}/usr/lib/libgssapi.so.4.0 between them - so do I
need one of these?

Cheers,

Stuart