/usr/lib/pkgconfig/cppunit.pc is in libcppunit-dev 1.12.1-4.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: CppUnit
Description: The C++ Unit Test Library
Version: 1.12.1
Libs: -L${libdir} -lcppunit
Libs.private: -ldl
Cflags: -I${includedir}
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