=> Bootstrap dependency digest>=20010302: found digest-20160304
===> Building for unrar-5.4.4
c++  -O2 -march=i586 -fPIC -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DRAR_SMP -DUNRAR -c rar.cpp
In file included from rar.cpp:1:
In file included from ./rar.hpp:65:
./threadpool.hpp:15:12: fatal error: 'pthread.h' file not found
  #include <pthread.h>
           ^
1 error generated.
makefile:110: recipe for target 'rar.o' failed
gmake: *** [rar.o] Error 1
*** Error code 2

Stop.
bmake[1]: stopped in /usr/pkgsrc/archivers/unrar
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/archivers/unrar