/usr/src/glibc/debian/sysdeps/m68k.mk is in eglibc-source 2.15-0ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | libc_MIN_KERNEL_SUPPORTED = 2.6.32
libc_add-ons = ports nptl $(add-ons)
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