/usr/mipsisa64r6el-linux-gnuabi64/include/asm/ipcbuf.h is in linux-libc-dev-mips64r6el-cross 4.15.0-18.19cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
#include <asm-generic/ipcbuf.h>