=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Checksum SHA1 OK for ck-0.4.1.tar.gz
=> Checksum RMD160 OK for ck-0.4.1.tar.gz
===> Installing dependencies for ck-0.4.1
=> Tool dependency pkg-config>=0.25: found pkg-config-0.28
===> Overriding tools for ck-0.4.1
===> Extracting for ck-0.4.1
===> Patching for ck-0.4.1
===> Creating toolchain wrappers for ck-0.4.1
===> Configuring for ck-0.4.1
=> Adding run-time search paths to pkg-config files.
Detecting operating system.......failed  [unsupported]
*** Error code 1

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

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