/usr/src/glibc/debian/sysdeps/m32r.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_add-ons = ports linuxthreads $(add-ons)
libc_extra_config_options = $(extra_config_options) --disable-sanity-checks
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