添加以下
set(MYSYSROOT /opt/fsl-imx-xwayland/5.4-zeus/sysroots/aarch64-poky-linux)
# compiler/linker flags
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE)
set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE)
set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE)
set(CMAKE_FIND_ROOT_PATH "${MYSYSROOT}")
示例：
SET(CMAKE_SYSTEM_NAME Linux)
SET(TOOLCHAIN_DIR "/opt/fsl-imx-xwayland/5.4-zeus/sysroots/x86_64-pokysdk-linux/usr/usr/bin/aarch64-poky-linux")
SET(CMAKE_FIND_ROOT_PATH "${TOOLCHAIN_DIR}")
SET(CMAKE_C_COMPILER "/opt/fsl-imx-xwayland/5.4-zeus/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gcc")
SET(CMAKE_CXX_COMPILER "/opt/fsl-imx-xwayland/5.4-zeus/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-g++")
set(MYSYSROOT /opt/fsl-imx-xwayland/5.4-zeus/sysroots/aarch64-poky-linux)
# compiler/linker flags
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE)
set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE)
set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE)
set(CMAKE_FIND_ROOT_PATH "${MYSYSROOT}")
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
#for libraries and headers in the target directories
#SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
#SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
SET(CMAKE_C_FLAGS"${CMAKE_C_FLAGS} --sysroot=/opt/fsl-imx-xwayland/5.4-zeus/sysroots/aarch64-poky-linux")
SET(CMAKE_CXX_FLAGS"${CMAKE_CXX_FLAGS} --sysroot=/opt/fsl-imx-xwayland/5.4-zeus/sysroots/aarch64-poky-linux")