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SYSROOT DESCRIPTION ----------- Sysroot is a directory which is considered to be the root directory for the purpose of locating headers and libraries. Most of the headers were generated from MUSL by compilation, you can see the license information of MUSL in COPYRIGHT file. usr/include/arm-liteos/fb.h was generated from NUTTX headers, to provide necessary information from kernel to userspace. usr/include/arm-liteos/linux, usr/include/arm-liteos/asm, usr/include/arm-liteos/asm-generic were generated from the Linux kernel headers by update_headers.py, to provide necessary information from kernel to userspace.