libwraster (and therefore windowmaker) refuse to build

[tech-lists]

Hello list,

portupgrade is having a problem updating libwraster and therefore
windowmaker.

I'm on -current r297389, ports is 413029.

here's the failing output:

===>  Building for libwraster-0.95.7_2
cd /storage/usr/ports/x11-wm/libwraster/work/WindowMaker-0.95.7 &&
/usr/bin/make config-paths.h
config-paths.h' is up to date.
--- all-recursive ---
Making all in .
--- libwraster.la ---
/bin/sh ../libtool  --tag=CC    --mode=link cc
-I/usr/local/include/ImageMagick-6 -fopenmp -DMAGICKCORE_HDRI_ENABLE=0
-DMAGICKCORE_QUANTUM_DEPTH=16 -O2 -pipe  -fstack-protector
-fno-strict-aliasing -Wall -Wextra -Wno-sign-compare -Wno-deprecated
-Wno-deprecated-declarations  -version-info 5:0:0
-Wl,--version-script=libwraster.map -L/usr/local/lib -fstack-protector
-o libwraster.la -rpath /usr/local/lib raster.lo alpha_combine.lo
draw.lo color.lo  load.lo save.lo gradient.lo xpixmap.lo convert.lo
context.lo  misc.lo scale.lo rotate.lo flip.lo convolve.lo save_xpm.lo
xutil.lo load_ppm.lo load_gif.lo load_jpeg.lo  load_png.lo
load_tiff.lo load_xpm.lo   load_webp.lo load_magick.lo
-L/usr/local/lib -L/usr/local/lib  -L/usr/local/lib  -lXpm -lpng
-ljpeg -lgif -ltiff -lwebp -L/usr/local/lib -lMagickWand-6
-lMagickCore-6   -lX11  -lXext -lXmu -lm -lkvm
libtool: link: cc -shared  -fPIC -DPIC  .libs/raster.o
.libs/alpha_combine.o .libs/draw.o .libs/color.o .libs/load.o
.libs/save.o .libs/gradient.o .libs/xpixmap.o .libs/convert.o
.libs/context.o .libs/misc.o .libs/scale.o .libs/rotate.o .libs/flip.o
.libs/convolve.o .libs/save_xpm.o .libs/xutil.o .libs/load_ppm.o
.libs/load_gif.o .libs/load_jpeg.o .libs/load_png.o .libs/load_tiff.o
.libs/load_xpm.o .libs/load_webp.o .libs/load_magick.o   -Wl,-rpath
-Wl,/usr/local/lib -Wl,-rpath -Wl,/usr/local/lib -L/usr/local/lib
-lXpm -lpng -ljpeg -lgif -ltiff -lwebp
/usr/local/lib/libMagickWand-6.so /usr/local/lib/libMagickCore-6.so
-lX11 -lXext -lXmu -lm -lkvm  -fopenmp -O2 -fstack-protector
-Wl,--version-script=libwraster.map -fstack-protector   -fopenmp
-pthread -Wl,-soname -Wl,libwraster.so.5 -o .libs/libwraster.so.5.0.0
/usr/bin/ld: cannot find -lomp
cc: error: linker command failed with exit code 1 (use -v to see
invocation)
*** [libwraster.la] Error code 1

make[2]: stopped in
/storage/usr/ports/x11-wm/libwraster/work/WindowMaker-0.95.7/wrlib
1 error

make[2]: stopped in
/storage/usr/ports/x11-wm/libwraster/work/WindowMaker-0.95.7/wrlib
*** [all-recursive] Error code 1

make[1]: stopped in
/storage/usr/ports/x11-wm/libwraster/work/WindowMaker-0.95.7/wrlib
1 error

make[1]: stopped in
/storage/usr/ports/x11-wm/libwraster/work/WindowMaker-0.95.7/wrlib
===> Compilation failed unexpectedly.
Try to set MAKE_JOBS_UNSAFE=yes and rebuild before reporting the
failure to
the maintainer.
*** Error code 1

Stop.
make: stopped in /storage/usr/ports/x11-wm/libwraster

Please advise how to fix?

thanks,

-- 
J.