===> Building for p5-Crypt-DH-GMP-0.00012
--- blib/lib/Crypt/DH/.exists ---
--- blib/arch/.exists ---
--- blib/lib/auto/Crypt/DH/GMP/.exists ---
--- blib/arch/auto/Crypt/DH/GMP/.exists ---
--- blib/bin/.exists ---
--- blib/script/.exists ---
--- blib/man1/.exists ---
--- blib/man3/.exists ---
--- subdirs ---
--- xs/GMP.c ---
  "/usr/pkg/bin/perl" "-Iinc"
  "/usr/pkg/lib/perl5/5.20.0/ExtUtils/xsubpp" -typemap
  "/usr/pkg/lib/perl5/5.20.0/ExtUtils/typemap" GMP.xs > GMP.xsc
  && mv GMP.xsc GMP.c

--- GMP.bs ---
Running Mkbootstrap for Crypt::DH::GMP ()
--- xs/GMP.c ---
cannot open GMP.xs: No such file or directory
--- GMP.bs ---
chmod 644 "GMP.bs"
--- xs/dh_gmp.o ---
--- xs/GMP.c ---
*** [xs/GMP.c] Error code 2

make: stopped in /export/WRKOBJDIR/security/p5-Crypt-DH-GMP/work/Crypt-DH-GMP-0.00012
--- xs/dh_gmp.o ---
gcc -c "-I." "-I." "-I/usr/pkg/include" "-I."  -O2 -pthread
  -I/usr/include -fwrapv -fno-strict-aliasing -pipe
  -fstack-protector -O2 -I/usr/pkg/include -I/usr/include
  -I/usr/pkg/include -I/usr/include -DVERSION=\"0.00012\"
  -DXS_VERSION=\"0.00012\" -o xs/dh_gmp.o -DPIC -fPIC
  "-I/usr/pkg/lib/perl5/5.20.0/x86_64-netbsd-thread-multi/CORE"
  -DUSE_PPPORT dh_gmp.c
gcc: dh_gmp.c: No such file or directory
gcc: no input files
*** [xs/dh_gmp.o] Error code 1

resolved by following line in pkgsrc Makefile

MAKE_JOBS_SAFE= NO