vimproc compile failed in netbsd5.0

gistfile1.sh

% make -f make_gcc.mak    
gcc -W -O2 -Wall -Wno-unused -std=gnu99 -pedantic -shared -fPIC -o autoload/proc.so autoload/proc.c  -lutil
autoload/proc.c:43:22: error: libutil.h: No such file or directory
autoload/proc.c: In function 'vp_pty_open':
autoload/proc.c:564: warning: implicit declaration of function 'openpty'
autoload/proc.c:571: warning: implicit declaration of function 'forkpty'
autoload/proc.c: In function 'vp_waitpid':
autoload/proc.c:750: warning: implicit declaration of function 'WIFCONTINUED'
autoload/proc.c: In function 'vp_decode':
autoload/proc.c:856: warning: array subscript has type 'char'
*** Error code 1

Stop.
make: stopped in /tmp/vimproc