conflicting dependency issue on glib2 variants x11 and quartz

[Riccardo Mottola]

Hi,

I had a complete working installation with no issues on 10.15 
(unfortunately not yet the case on 10.13 or lower...).

I did selfupdate today, which also includes a macports upgrade, and get 
conflicts over and over between glib2 with x11 and quartz. The Mac is 
set to prefer quartz.

port installed
   glib2 @2.88.0_0+quartz

port info glib2
glib2 @2.88.0 (devel)
Sub-ports:            glib2-bootstrap
Variants:             debug, debugoptimized, quartz, [+]x11

--->  Upgrading atk (1/15)
--->  Computing dependencies for atk
The following dependencies will be installed:  glib2 +x11
Continue? [Y/n]:

if I answer No, I get a series of failures of other ports requiring x11, 
if I answer yes, I get


--->  Upgrading atk (1/15)
--->  Computing dependencies for atk
The following dependencies will be installed:  glib2 +x11
Continue? [Y/n]:
Error: Requested variants "+x11" do not match those the build was 
started with: "+quartz".
Error: Please use the same variants again, or run 'port clean glib2' 
first to remove the existing partially completed build.
Error: See 
/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_glib2/glib2/main.log 
for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe 
there is a bug.

how to get out?

Riccardo