Recent gtk2+/gtk3+ 'make package' failure

[Chavdar Ivanov <ci4ic4%gmail.com@localhost>]

My last successful build of the two packages (among the rest during a 
pkg_rolling-replace) was on the 29th of September. 
Exactly the same versions fail to build today (after a pkgsrc cvs update 
and a full pkg_rolling-replace) as follows:

...
  GEN      immodules.cache
Cannot load module 
/usr/pkgsrc/x11/gtk3/work/gtk+-3.24.34/modules/input/im-am-et.la: 
/usr/pkgsrc/x11/gtk3/work/gtk+-3.24.34/modules/input/.libs/: read error: 
Operation not supported by device
/usr/pkgsrc/x11/gtk3/work/gtk+-3.24.34/modules/input/im-am-et.la does not 
export GTK+ IM module API: 
/usr/pkgsrc/x11/gtk3/work/gtk+-3.24.34/modules/input/.libs/: read error: 
Operation not supported by device
...

and the same for each .am file in the same directory (13 altogether for 
gtk3 and 11 for gtk2, identical error). 

The last line of these generated .am files is as follows:

# Directory that this library needs to be installed in:
libdir='/usr/pkg/lib/gtk-3.0/3.0.0/immodules'
# buildlink modification
relink_command="(cd /usr/pkgsrc/x11/gtk3/work/gtk+-3.24.34/modules/input; 
/usr/pkgsrc/x11/gtk3/work/.cwrapper/bin/libtool --silent --tag CC 
--mode=relink gcc -O2 -std=gnu99 -fPIC -pthread -Wall -rpath 
/usr/pkg/lib/gtk-3.0/3.0.0/immodules -avoid-version -module -Wl,-zrelro 
-L/usr/pkgsrc/x11/gtk3/work/.buildlink/lib -Wl,-rpath,/usr/pkg/lib -pthread 
-L/usr/pkgsrc/x11/gtk3/work/.x11-buildlink/lib -Wl,-rpath,/usr/X11R7/lib -o 
im-xim.la -rpath /usr/pkg/lib/gtk-3.0/3.0.0/immodules gtkimcontextxim.lo 
imxim.lo -L../../gtk/.libs ../../gtk/libgtk-3.la -lpangocairo-1.0 -lX11 
-lXi -lXcomposite -lXdamage -lXfixes -lcairo-gobject -lcairo 
-lgdk_pixbuf-2.0 -latk-1.0 -latk-bridge-2.0 -lxkbcommon -lwayland-cursor 
-lwayland-egl -lwayland-client -Wl,-rpath,/usr/X11R7/lib -lepoxy -lfribidi 
-lpangoft2-1.0 -lpango-1.0 -lharfbuzz -lfontconfig -lfreetype -lgio-2.0 
-lgobject-2.0 -Wl,-rpath,/usr/pkg/lib -lglib-2.0 -lintl -lm -lpangoft2-1.0 
-lpango-1.0 -lgobject-2.0 -lglib-2.0 -lintl -lharfbuzz 
-Wl,-rpath,/usr/pkg/lib -lfontconfig -lfreetype -pie @inst_prefix_dir@)"

and the source of the problem is seen in the non-replaced 
@inst_prefix_dir@. 

I have no idea what has changed in between, the /etc/mk.conf is the same 
and the rest appears more or less so. The system in use is amd64 9.99.100 
from today. 

Any suggestion? 

--
----
Chavdar Ivanov