rpath relative to WRKDIR on 5.99.49 but not netbsd-5

[David Brownlee <abs%absd.org@localhost>]

Have another (seemlingly) random difference between a netbsd-5 and
5.99.49 current amd64 box with updated pkgsrc.

graphics/gdk-pixbuf2-xlib, x11/qt4-libs and devel/GConf are failing to
build on my 5.99.49 box with an error of the form:

=> Checking for missing run-time search paths in gdk-pixbuf2-xlib-2.22.1nb1
ERROR: lib/libgdk_pixbuf_xlib-2.0.so: rpath relative to WRKDIR
ERROR: lib/libgdk_pixbuf_xlib-2.0.so.0: rpath relative to WRKDIR
ERROR: lib/libgdk_pixbuf_xlib-2.0.so.0.2200.1: rpath relative to WRKDIR


after build on current box:

% readelf -d 
work/gdk-pixbuf-2.22.1/contrib/gdk-pixbuf-xlib/.libs/libgdk_pixbuf_xlib-2.0.so|grep
RPATH
 0x000000000000000f (RPATH)              Library rpath:
[/var/obj/pkg/graphics/gdk-pixbuf2-xlib/work/.buildlink/lib:/usr/pkg/lib]


after build on netbsd-5 box:

% readelf -d 
work/gdk-pixbuf-2.22.1/contrib/gdk-pixbuf-xlib/.libs/libgdk_pixbuf_xlib-2.0.so|grep
RPATH
 0x000000000000000f (RPATH)              Library rpath: [/usr/pkg/lib]

Anyone else seeing anything similar?