unknown linker error

[Mark Davies <mark%ecs.vuw.ac.nz@localhost>]

I'm in the process of trying to update the qt5 packages to 5.7.1 and I'm 
making progress but just hit an error I've never seen before:

[...]
libtool --silent --mode=link c++ -version-info 12:1:7 -rpath 
/usr/pkg/qt5/lib -lexecinfo -lkvm -L/usr/pkg/lib -Wl,-R/usr/pkg/lib 
-L/usr/lib -Wl,-R/usr/lib -Wl,--version-script,QtPrintSupport.version 
-pthread -Wl,-rpath,/usr/pkg/qt5/lib -shared -Wl,-Bsymbolic-functions -o 
../../lib/libQt5PrintSupport.la .obj/qpaintengine_alpha.lo 
.obj/qpaintengine_preview.lo .obj/qprintdevice.lo 
.obj/qprintengine_pdf.lo .obj/qprinter.lo .obj/qprinterinfo.lo 
.obj/qplatformprintdevice.lo .obj/qplatformprintplugin.lo 
.obj/qplatformprintersupport.lo .obj/qcups.lo 
.obj/qprintpreviewwidget.lo .obj/qcupsjobwidget.lo 
.obj/qprintdialog_unix.lo .obj/qpagesetupdialog_unix.lo 
.obj/qabstractprintdialog.lo .obj/qpagesetupdialog.lo 
.obj/qprintpreviewdialog.lo .obj/qrc_qprintdialog.lo 
.obj/moc_qplatformprintplugin.lo .obj/moc_qcupsjobwidget_p.lo 
.obj/moc_qabstractprintdialog.lo .obj/moc_qpagesetupdialog_unix_p.lo 
-L/usr/pkg/lib 
-L/src/work/pkgsrc/x11/qt5-qtbase/work.x86_64/qtbase-opensource-src-5.7.1/lib 
-lQt5Widgets -L/usr/lib -lQt5Gui -lQt5Core -lexecinfo -lkvm 
-Wl,-R/usr/pkg/lib -lGL
ld: BFD (NetBSD Binutils nb1) 2.23.2 assertion fail 
/src/work/7/src/external/gpl3/binutils/dist/bfd/elflink.c:2547
ld: BFD (NetBSD Binutils nb1) 2.23.2 assertion fail 
/src/work/7/src/external/gpl3/binutils/dist/bfd/elflink.c:2547
Makefile:244: recipe for target 
'../../lib/../../lib/libQt5PrintSupport.la' failed

anyone know what this is complaining about? (this is on 7.0_STABLE)

cheers
mark