/usr/src/glibc/debian/sysdeps/ppc64el.mk is in eglibc-source 2.19-0ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | libc_rtlddir = /lib64
extra_config_options = --enable-multi-arch --with-cpu=power7
extra_cflags = -O3 -fno-tree-vectorize
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