/usr/lib/x86_64-linux-gnu/pkgconfig/globus-callout.pc is in libglobus-callout-dev 3.13-5.
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 6 7 8 9 10 11 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/globus
Name: globus-callout
Description: Globus Toolkit - Globus Callout Library
Version: 3.13
Requires.private: globus-common >= 15
Libs: -L${libdir} -lglobus_callout
Cflags: -I${includedir}
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