ffmpeg 4 failure

hdiutil attach /Users/labyone/Documents/ffmpeg-master.cdr

export CC="/usr/bin/clang"
export CXX="/usr/bin/clang++"
export CPP="clang -E"
export CXXCPP="clang++ -E"
export LDFLAGS="-stdlib=libc++"
export CXXFLAGS="-stdlib=libc++"
export VOLNAME=ffmpeg-master
export MCB="/Volumes/USB3/_Files/_TODO/FFMPEG_3/mediaencoding"
export MES=${MCB}/base/
export TARGET="/Volumes/${VOLNAME}/"
export CMPL="/Volumes/${VOLNAME}/compile"
export PATH=${TARGET}/bin:$PATH
export LDFLAGS="-L${TARGET}/lib $CFLAGS"
export  CFLAGS="-I${TARGET}/include $LDFLAGS"
export PKG_CONFIG_PATH=${TARGET}/lib/pkgconfig
mkdir -p ${CMPL}
export MKMU="make -j 4"
cd ${CMPL} || exit 1
curl -O http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
tar xjpf ffmpeg*
cd ffmpeg*
./configure --cc=/usr/bin/clang \
--as=yasm \
--prefix=${TARGET} \
--extra-version=labyone \
--enable-openssl \
--enable-static \
--enable-libass \
--enable-opencl \
--enable-libmp3lame \
--enable-libtwolame \
--enable-avresample \
--enable-libvidstab \
--enable-filters \
--enable-libsoxr \
--enable-libopus \
--enable-libwavpack \
--enable-libxvid \
--enable-libxavs \
--enable-libtheora \
--enable-libvorbis \
--enable-libfdk-aac \
--enable-libopenh264 \
--enable-libx264 \
--enable-libx265 \
--enable-libkvazaar \
--enable-libbluray \
--enable-openal \
--enable-libvo-amrwbenc \
--enable-libopencore-amrnb \
--enable-libopencore-amrwb \
--enable-frei0r \
--enable-avisynth \
--enable-avfilter \
--enable-libspeex \
--enable-libmodplug \
--enable-fontconfig \
--enable-libfreetype \
--enable-libfribidi \
--enable-zlib \
--enable-libgsm \
--enable-libilbc \
--enable-bzlib \
--enable-libsnappy \
--enable-ladspa \
--enable-libzimg \
--enable-libvmaf \
--enable-libzmq \
--enable-audiotoolbox \
--enable-videotoolbox \
--enable-libflite \
--enable-bsfs \
--enable-pthreads \
--enable-postproc \
--enable-libvpx \
--enable-version3 \
--enable-nonfree \
--enable-gpl \
--enable-gray \
--pkg-config-flags=--static \
--disable-ffplay \
--enable-runtime-cpudetect \
--disable-shared && $MKMU && make install