/usr/libx32/libpthread.so is in libc6-dev-x32 2.24-11+deb9u4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | /* GNU ld script
Use the shared library, but some functions are only in
the static library, so try that secondarily. */
OUTPUT_FORMAT(elf32-x86-64)
GROUP ( /libx32/libpthread.so.0 /usr/libx32/libpthread_nonshared.a )
|