pgp 설치하려고 하는데요 좀 알려주세요

로그인 한 후 su로 루트권한을 가지고
./configure한다음에
make install을 실행하면요
에러가 나와요
에러 내용은요
Making install in lib
make[1]: Entering directory `/export/home/dennis_min/pgp50i/src/lib'
Making install in lib/bn
make[2]: Entering directory `/export/home/dennis_min/pgp50i/src/lib/bn'
if test 'x' != x; then \
if test ! -d /usr/local/include; then \
mkdir -p /usr/local/include; \
fi; \
for i in ''; do \
../../config/install-sh -c -m 644 ./$i \
/usr/local/include; \
done \
else :; \
fi
if test 'xlibbn.a' != x; then \
if test ! -d /usr/local/lib; then \
mkdir -p /usr/local/lib; \
fi; \
for i in libbn.a''; do \
../../config/install-sh -c -m 644 $i /usr/local/lib; \
done \
else :; \
fi
install: libbn.a does not exist
make[2]: *** [install] Error 1
make[2]: Leaving directory `/export/home/dennis_min/pgp50i/src/lib/bn'
make[1]: *** [install] Error 1
make[1]: Leaving directory `/export/home/dennis_min/pgp50i/src/lib'
make: *** [install] Error 1

어떻게 해결해야 할지 도저히 모르겠습니다. 좀 알려주세요