/usr/lib/x86_64-linux-gnu/pkgconfig/libpgf.pc is in libpgf-dev 6.14.12-3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=/usr/include/libpgf
Name: libpgf
Description: libpgf - Progressive Graphics File (PGF) library
Version: 6.14.12
Libs: -L${libdir} -lpgf
Cflags: -I${includedir}
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