problem with includes rebuilding some ports

[Barbara]

While rebuilding some ports after gnutls update, I'm getting some errors  
caused by "missing" includes.
For example, to rebuild devel/gvfs, I had to add:
-I${LOCALBASE}/include/libsoup-2.4 -I${LOCALBASE}/include/libsoup-gnome-2.4 -
I${LOCALBASE}/include/libxml2
to CONFIGURE_ENV in Makefile because libsoup/soup.h libxml/parser.h and others 
weren't found during the build.
I can understand that this is not the solution and that the gnutls update is 
not the cause of the problem, but I can't understand why this is happening.
Any idea?

Thanks
Barbara