LINUX doubango编译中prefix参数无效

UILD_LIBS=${HOME}/build_libs
export PATH=${BUILD_LIBS}/bin:${PATH}
CFLAGS=${BUILD_LIBS}/include
LDFLAGS=${BUILD_LIBS}/lib
if [ -f autogen.sh ]; then
    chmod 777 autogen.sh
    # ./autogen.sh
fi
autoreconf -fvi
chmod 777 configure
./configure  \
    --prefix=${BUILD_LIBS}  \
    --exec-prefix=${BUILD_LIBS} \
    CFLAGS=${BUILD_LIBS}/include \
    LDFLAGS=${BUILD_LIBS}/lib \
    --with-ssl --with-srtp --with-vpx --with-yuv --with-amr --with-speex --with-speexdsp --enable-speexresampler --enable-speexdenoiser --with-opus --with-gsm --with-ilbc --with-g729 --with-ffmpeg

 /usr/bin/mkdir -p '/usr/local/lib'
 /bin/bash ../libtool   --mode=install /usr/bin/install -c   libtinySAK.la '/usr/local/lib'
libtool: install: /usr/bin/install -c .libs/libtinySAK.so.0.0.0 /usr/local/lib/libtinySAK.so.0.0.0
/usr/bin/install: cannot create regular file '/usr/local/lib/libtinySAK.so.0.0.0': Permission denied
make[2]: *** [Makefile:473：install-libLTLIBRARIES] 错误 1
make[2]: 离开目录“/home/quantum6/doubango/doubango/tinySAK”
make[1]: *** [Makefile:764：install-am] 错误 2
make[1]: 离开目录“/home/quantum6/doubango/doubango/tinySAK”
make: *** [Makefile:493：install-recursive] 错误 1