=> Bootstrap dependency digest>=20010302: found digest-20160304
===> Building for sslsplit-0.4.10nb1
pkg-config: not found
SSLsplit 0.4.10
via pkg-config: 
OPENSSL_BASE:   /usr
LIBEVENT_BASE:  /usr
Build options:  -DHAVE_IPFW -DHAVE_PF
cc -c -I/usr/include -isystem/usr/include -isystem/usr/include -D_GNU_SOURCE -D"BNAME=\"sslsplit\"" -D"PNAME=\"SSLsplit\"" -D"VERSION=\"0.4.10\"" -D"BUILD_DATE=\"2016-11-26\"" -D"FEATURES=\"-DHAVE_IPFW -DHAVE_PF\"" -D"BUILD_INFO=\"V:FILE\"" -DHAVE_IPFW -DHAVE_PF -O2 -march=i586 -I/usr/include  -std=c99 -Wall -Wextra -pedantic -D_FORTIFY_SOURCE=2 -fstack-protector-all -pthread -o cachessess.o cachessess.c
In file included from cachessess.c:29:
In file included from ./cachessess.h:32:
./cache.h:34:10: fatal error: 'pthread.h' file not found
#include <pthread.h>
         ^
1 error generated.
GNUmakefile:320: recipe for target 'cachessess.o' failed
gmake: *** [cachessess.o] Error 1
*** Error code 2

Stop.
bmake[1]: stopped in /usr/pkgsrc/security/sslsplit
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/security/sslsplit