build failed with cross compile on opengl ES2 support.

[iysheng]

I want to cross compile the package with aarch64 platform which support opengl ES2, I write a crosss.cmake like

# the name of the target operating system
set(CMAKE_SYSTEM_NAME Linux)

set(CMAKE_SYSTEM_PROCESSOR aarch64)
set(TOOLCHAIN_PATH /home/wj/Linux/LinuxSDK/rk3576_linux6.1_release/buildroot/output/rockchip_rk3576/host)
set(CMAKE_C_COMPILER   ${TOOLCHAIN_PATH}/bin/aarch64-linux-gcc)
set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PATH}/bin/aarch64-linux-g++)

when I try to build , I get failed as

/home/wj/nanogui/ext/glfw/include/GLFW/glfw3.h:241:12: fatal error: GL/gl.h: No such file or directory
  241 |   #include <GL/gl.h>
      |            ^~~~~~~~~