% sudo port -d install inkscape +quartz 
...
DEBUG: Starting logging for glibmm
DEBUG: dropping privileges: euid changed to 502, egid changed to 20.
DEBUG: Executing org.macports.main (glibmm)
DEBUG: Privilege de-escalation not attempted as not running as root.
DEBUG: archivefetch phase started at Tue Nov 21 17:09:32 WET 2017
--->  Fetching archive for glibmm
DEBUG: Executing proc-pre-org.macports.archivefetch-archivefetch-0
DEBUG: Active variants check for archivefetch-type install considers depends_lib depends_run: glib2 libsigcxx2
DEBUG: Checking glib2 for active variants for depspec 'path:lib/pkgconfig/glib-2.0.pc:glib2'
DEBUG: glib2 is installed with the following variants: +x11
DEBUG:   required: quartz, forbidden: 
DEBUG:   rejected, because required variant quartz is missing
Error: Failed to archivefetch glibmm: glib2 must be installed with +quartz.
DEBUG: Error code: NONE
DEBUG: Backtrace: glib2 must be installed with +quartz.
    while executing
"$pre $targetname"
DEBUG: Failed to locate 'lbzip2' in path: '/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin' or at its MacPorts configuration time location, did you move it?
    while executing
"error "$eMessage or at its MacPorts configuration time location, did you move it?""
    invoked from within
"try -pass_signal {
            set cmd_path [macports::binaryInPath $prog]
            return $cmd_path
        } catch {{*} eCode eMessage} {
       ..."
    (procedure "macports::findBinary" line 5)
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_glibmm/glibmm/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port inkscape failed