=> Bootstrap dependency digest>=20010302: found digest-20160304
===> Building for lmdb-0.9.18
gcc -pthread -O2 -g -W -Wall -Wno-unused-parameter -Wbad-function-cast -Wuninitialized -D_SEM_SEMUN_UNDEFINED  -c mdb.c
mdb.c:126:10: fatal error: 'pthread.h' file not found
#include <pthread.h>
         ^
1 error generated.
Makefile:82: recipe for target 'mdb.o' failed
gmake: *** [mdb.o] Error 1
*** Error code 2

Stop.
bmake[1]: stopped in /usr/pkgsrc/databases/lmdb
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/databases/lmdb