x265 multi bit depth does not compile dlopen

Using the next script I get a compilation error in the last step

SCRIPT

    local ld_flags=$LDFLAGS
    local extra_cmake_options="-DENABLE_SHARED=0 -DENABLE_PIC=1"
    mkdir -p 8bit 10bit 12bit
    cd 12bit
      do_cmake "-DCMAKE_INSTALL_PREFIX=$install_prefix $extra_cmake_options -DHIGH_BIT_DEPTH=1 -DENABLE_HDR10_PLUS=1 -DMAIN12=1 -DEXPORT_C_API=0 -DENABLE_CLI=0" ../source
      do_make
      cp libx265.a ../8bit/libx265_main12.a
    cd ../10bit
      do_cmake "-DCMAKE_INSTALL_PREFIX=$install_prefix $extra_cmake_options -DHIGH_BIT_DEPTH=1 -DENABLE_HDR10_PLUS=1 -DMAIN10=1 -DEXPORT_C_API=0 -DENABLE_CLI=0" ../source
      do_make
      cp libx265.a ../8bit/libx265_main10.a
    cd ../8bit
      if [[ $compiler_flavors != android* ]]; then
        extra_cmake_options+=" -DENABLE_CLI=1"
      else
        extra_cmake_options+=" -DENABLE_CLI=0"
      fi      
      do_cmake "-DCMAKE_INSTALL_PREFIX=$install_prefix $extra_cmake_options -DHIGH_BIT_DEPTH=0 -DENABLE_HDR10_PLUS=0 -DEXTRA_LINK_FLAGS=-L. -DLINKED_10BIT=1 -DLINKED_12BIT=1 -DEXTRA_LIB=x265_main10.a;x265_main12.a -DEXPORT_C_API=1" ../source
      do_make
      mv libx265.a libx265_main.a
      if [[ $OSTYPE == linux* ]]; then
ar -M <<EOF
CREATE libx265.a
ADDLIB libx265_main.a
ADDLIB libx265_main10.a
ADDLIB libx265_main12.a
SAVE
END
EOF
      else
        libtool -static -o libx265.a libx265_main.a libx265_main10.a libx265_main12.a 2>/dev/null
      fi
      do_make_install
    cd ..
    export LDFLAGS=$ld_flags

ERROR

./libx265_main10.a(api.cpp.o): In function `x265_10bit::x265_api_get_179(int)':
api.cpp:(.text+0x1bd4): undefined reference to `dlopen'
api.cpp:(.text+0x1bec): undefined reference to `dlsym'
api.cpp:(.text+0x1c7d): undefined reference to `dlopen'
./libx265_main10.a(api.cpp.o): In function `x265_10bit::x265_api_query(int, int, int*)':
api.cpp:(.text+0x1d37): undefined reference to `dlopen'
api.cpp:(.text+0x1d4f): undefined reference to `dlsym'
api.cpp:(.text+0x1e05): undefined reference to `dlopen'
./libx265_main12.a(api.cpp.o): In function `x265_12bit::x265_api_get_179(int)':
api.cpp:(.text+0x1bd4): undefined reference to `dlopen'
api.cpp:(.text+0x1bec): undefined reference to `dlsym'
api.cpp:(.text+0x1c7d): undefined reference to `dlopen'
./libx265_main12.a(api.cpp.o): In function `x265_12bit::x265_api_query(int, int, int*)':
api.cpp:(.text+0x1d37): undefined reference to `dlopen'
api.cpp:(.text+0x1d4f): undefined reference to `dlsym'
api.cpp:(.text+0x1e05): undefined reference to `dlopen'
collect2: error: ld returned 1 exit status
make[2]: *** [x265] Error 1
make[1]: *** [CMakeFiles/cli.dir/all] Error 2
make: *** [all] Error 2

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