=> "/opt/pkg/bin/bmake" ["-C", "/data/jenkins/workspace/pkgsrc-upstream-trunk/sysutils/lockf", "all", "BATCH=1", "DEPENDS_TARGET=/nonexistent"]
===> Building for lockf-1
cd /home/pbulk/work/sysutils/lockf/work;  echo "gcc -o lockf lockf.c";  gcc  -pipe -O2 -msave-args -fno-aggressive-loop-optimizations   -Wl,-R/opt/pkg/lib -o lockf lockf.c
gcc -o lockf lockf.c
lockf.c:26:10: fatal error: sys/cdefs.h: No such file or directory
   26 | #include <sys/cdefs.h>
      |          ^~~~~~~~~~~~~
compilation terminated.
*** Error code 1

Stop.
bmake[1]: stopped making "all" in /data/jenkins/workspace/pkgsrc-upstream-trunk/sysutils/lockf
*** Error code 1

Stop.
bmake: stopped making "all" in /data/jenkins/workspace/pkgsrc-upstream-trunk/sysutils/lockf