gtk3 segfault?

:info:build clang: error: unable to execute command: Segmentation fault
:info:build clang: error: linker command failed due to signal (use -v to see invocation)
:info:build make[3]: *** [testgeometry] Error 254
:info:build make[3]: *** Waiting for unfinished jobs....
:info:build libtool: link: /opt/local/bin/clang-mp-3.7 -arch x86_64 -pipe -Os -fstrict-aliasing -arch x86_64 -Wall -Wl,-headerpad_max_install_names -arch x86_64 -o .libs/testglblending testglblending.o gtkgears.o  -L/opt/local/lib ../gtk/.libs/libgtk-3.dylib /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/work/gtk+-3.20.9/gdk/.libs/libgdk-3.dylib -lgmodule-2.0 ../gdk/.libs/libgdk-3.dylib -latk-1.0 -latk-bridge-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lpango-1.0 -lgdk_pixbuf-2.0 -lcairo-gobject -lgio-2.0 -lgobject-2.0 -lglib-2.0 /opt/local/lib/libintl.dylib -lfontconfig -lfreetype -lXinerama -lXi -lXrandr -lXcursor -lXcomposite -lXdamage -lXfixes -lcairo -lX11 -lXext -lepoxy -lm
:info:build libtool: link: /opt/local/bin/clang-mp-3.7 -arch x86_64 -pipe -Os -fstrict-aliasing -arch x86_64 -Wall -Wl,-headerpad_max_install_names -arch x86_64 -o .libs/testgrid testgrid.o  -L/opt/local/lib ../gtk/.libs/libgtk-3.dylib /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/work/gtk+-3.20.9/gdk/.libs/libgdk-3.dylib -lgmodule-2.0 ../gdk/.libs/libgdk-3.dylib -latk-1.0 -latk-bridge-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lpango-1.0 -lgdk_pixbuf-2.0 -lcairo-gobject -lgio-2.0 -lgobject-2.0 -lglib-2.0 /opt/local/lib/libintl.dylib -lfontconfig -lfreetype -lXinerama -lXi -lXrandr -lXcursor -lXcomposite -lXdamage -lXfixes -lcairo -lX11 -lXext -lepoxy -lm
:info:build libtool: link: /opt/local/bin/clang-mp-3.7 -arch x86_64 -pipe -Os -fstrict-aliasing -arch x86_64 -Wall -Wl,-headerpad_max_install_names -arch x86_64 -o .libs/testgtk testgtk.o  -L/opt/local/lib ../gtk/.libs/libgtk-3.dylib /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/work/gtk+-3.20.9/gdk/.libs/libgdk-3.dylib -lgmodule-2.0 ../gdk/.libs/libgdk-3.dylib -latk-1.0 -latk-bridge-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lpango-1.0 -lgdk_pixbuf-2.0 -lcairo-gobject -lgio-2.0 -lgobject-2.0 -lglib-2.0 /opt/local/lib/libintl.dylib -lfontconfig -lfreetype -lXinerama -lXi -lXrandr -lXcursor -lXcomposite -lXdamage -lXfixes -lcairo -lX11 -lXext -lepoxy -lm
:info:build make[3]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/work/gtk+-3.20.9/tests'
:info:build make[2]: *** [all-recursive] Error 1
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/work/gtk+-3.20.9/tests'
:info:build make[1]: *** [all-recursive] Error 1
:info:build make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/work/gtk+-3.20.9'
:info:build make: *** [all] Error 2
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/work/gtk+-3.20.9'
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/work/gtk+-3.20.9" && /usr/bin/make -j4 -w all CC="/opt/local/bin/clang-mp-3.7 -arch x86_64" CC_FOR_BUILD="/opt/local/bin/clang-mp-3.7 -arch x86_64" V=1 CPP_FOR_BUILD="/usr/bin/cpp"
:info:build Exit code: 2
:error:build org.macports.build for port gtk3 returned: command execution failed
:debug:build Error code: CHILDSTATUS 75699 2
:debug:build Backtrace: command execution failed
    while executing
"system -nice 0 $fullcmdstring"
    ("eval" body line 1)
    invoked from within
"eval system $notty $nice \$fullcmdstring"
    invoked from within
"command_exec build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"portbuild::build_main org.macports.build"
    ("eval" body line 1)
    invoked from within
"eval $procedure $targetname"
:info:build Warning: targets not executed for gtk3: org.macports.install org.macports.build org.macports.destroot
:notice:build Please see the log file for port gtk3 for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_gnome_gtk3/gtk3/main.log