(wip/klayout, not committed yet):

gcc -I/export/WRKOBJDIR/wip/klayout/work/klayout-0.24.5/src
-I/export/WRKOBJDIR/wip/klayout/work/klayout-0.24.5/src
-I. -I/usr/pkg/qt4/include -I/usr/pkg/include/python2.7
-I/usr/pkg/include/ruby-2.3.0
-I/usr/pkg/include/ruby-2.3.0/x86_64-netbsd -Wall -pedantic
-Wno-deprecated -Woverloaded-virtual -Wsign-promo -Wsynth
-Wno-long-long -Wno-strict-aliasing -DQT_THREAD_SUPPORT
-DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DHAVE_PYTHON
-DHAVE_PYTHON_VERSION_CODE= -DHAVE_RUBY
-DHAVE_RUBY_VERSION_CODE=20300 -fPIC -c -m32 -O2 -o
layApplication.o
/export/WRKOBJDIR/wip/klayout/work/klayout-0.24.5/src/layApplication.cc

/export/WRKOBJDIR/wip/klayout/work/klayout-0.24.5/src/layApplication.cc:
In function 'void lay::install_signal_handlers()':

/export/WRKOBJDIR/wip/klayout/work/klayout-0.24.5/src/layApplication.cc:353:7:
   error: 'struct sigaction' has no member named 'sa_restorer'
   act.sa_restorer = 0; 
       ^
/export/WRKOBJDIR/wip/klayout/work/klayout-0.24.5/src/Makefile.rules:166:
recipe for target 'layApplication.o' failed

gmake[3]: *** [layApplication.o] Error 1