/usr/lib/x86_64-linux-gnu/pkgconfig/globus-gsi-proxy-ssl.pc is in libglobus-gsi-proxy-ssl-dev 5.10-2build1.
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=${prefix}/include/globus
Name: globus-gsi-proxy-ssl
Description: Globus Toolkit - Globus GSI Proxy SSL Library
Version: 5.10
Requires.private: openssl >= 1.0
Libs: -L${libdir} -lglobus_proxy_ssl
Cflags: -I${includedir}
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