/usr/lib/x86_64-linux-gnu/pkgconfig/log4cpp.pc is in liblog4cpp5-dev 1.1.1-3.
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=${prefix}/include
Name: log4cpp
Description: C++ library for flexible logging, modeled after Log4j
Version: 1.1
Libs: -L${libdir} -llog4cpp -lpthread -lnsl
Cflags: -I${includedir}
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