/usr/lib/pkgconfig/gkrellm.pc is in gkrellm 2.3.6~rc1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name: GKrellM
Description: Extensible GTK system monitoring application
Version: 2.3.6-RC1
Requires: gtk+-2.0 >= 2.4.0
Cflags: -I/usr/include
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