Details on this package are located in Section 6.7.2, “Contents of Linux API Headers.”
The Linux API Headers expose the kernel's API for use by Glibc.
The Linux kernel needs to expose an Application Programming Interface (API) for the system's C library (Glibc in LFS) to utilize. This is done by way of sanitizing various C header files that are shipped in the Linux kernel source tarball.
Install the header files:
make mrproper make headers_check make INSTALL_HDR_PATH=dest headers_install cp -rv dest/include/* /tools/include
Details on this package are located in Section 6.7.2, “Contents of Linux API Headers.”