=> Bootstrap dependency digest>=20010302: found digest-20160304
===> Building for modcap-0.0.5nb1
cd /usr/pkgsrc/work/net/modpcap/work && cc -I/usr/pkg/include modcap.c -lm -lpcap   -L/usr/pkg/lib -Wl,-R/usr/pkg/lib -o modcap
modcap.c:81:10: fatal error: 'pthread.h' file not found
#include <pthread.h>
         ^
1 error generated.
*** Error code 1

Stop.
bmake[1]: stopped in /usr/pkgsrc/net/modpcap
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/net/modpcap