Linux下使用鸿蒙交叉编译工具链编译的时候提示不能识别系统OHOS是什么问题呢

#!/bin/bashexport OHOS_SDK_HONE=/harmony/sdkexport OHOS_NATIVE_HOME=/harmony/sdk/native/3.0.0.0export AR=$OHOS_NATIVE_HOME/llvm/bin/llvm-arexport AS=$OHOS_NATIVE_HOME/llvm/bin/llvm-asexport CC=$OHOS_NATIVE_HOME/llvm/bin/clangexport LD=$OHOS_NATIVE_HOME/llvm/bin/ld.lldexport RANLIB=$OHOS_NATIVE_HOME/llvm/bin/llvm-ranlibexport STRIP=$OHOS_NATIVE_HOME/llvm/bin/llvm-stripexport CFLAGS="--target=arm-linux-ohos --gcc-toolchain=$OHOS_NATIVE_HOME/llvm --sysroot=$OHOS_NATIVE_HOME/sysroot -g -fvisibility=hidden -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fno-addrsig -Wa,--noexecstack -Wformat -Werror=format-security -fno-limit-debug-info  -fPIC -MD -march=armv7-a -mthumb"export LDFLAGS="--rtlib=compiler-rt -fuse-ld=lld "export CPPFLAGS="--gcc-toolchain=$OHOS_NATIVE_HOME/llvm --sysroot=$OHOS_NATIVE_HOME/sysroot"export LIBS="-lunwind"export CMAKE_SYSTEM_NAME=OHOSexport CMAKE_SYSTEM_PROCESSOR=armexport CMAKE_C_COMPILER=$OHOS_NATIVE_HOME/llvm/bin/clangexport CMAKE_CXX_COMPILER=$OHOS_NATIVE_HOME/llvm/bin/clang++pwdcd /home/pozhu/桌面/HarmonyCrossCompilation/freetype-2.3.5./configure --prefix=/home/pozhu/桌面/HarmonyCrossCompilation/build_output/mmm \            --target=arm-linux-ohos \            --host=arm-linux \            --disable-shared \            --disable-threaded-resolver