/usr/lib/pkgconfig/libgadu.pc is in libgadu-dev 1:1.11.1-1ubuntu0.2.
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 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libgadu
Version: 1.11.1
Description: libgadu
Requires:
Requires.private: gnutls
Libs: -L${libdir} -lgadu
Libs.private: -L${libdir} -lgadu -pthread -lz
Cflags: -I${includedir} -pthread
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