=> Bootstrap dependency digest>=20010302: found digest-20160304
=> Checksum SHA1 OK for ck-0.5.1.tar.gz
=> Checksum RMD160 OK for ck-0.5.1.tar.gz
=> Checksum SHA512 OK for ck-0.5.1.tar.gz
===> Installing dependencies for ck-0.5.1
=> Tool dependency pkgconf-[0-9]*: found pkgconf-1.0.1
===> Overriding tools for ck-0.5.1
===> Extracting for ck-0.5.1
tar: Global extended headers posix ustar archive. Extracting as plain files. Following files might be in the wrong directory or have wrong attributes.
===> Patching for ck-0.5.1
===> Creating toolchain wrappers for ck-0.5.1
===> Configuring for ck-0.5.1
=> Adding run-time search paths to pkg-config files.
Detecting operating system.......failed  [unsupported]
*** Error code 1

Stop.
bmake[1]: stopped in /usr/pkgsrc/devel/concurrencykit
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/concurrencykit