/usr/lib/x86_64-linux-gnu/pkgconfig/primesieve.pc is in libprimesieve-dev 6.3+ds-2ubuntu1.
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
bindir=${prefix}/bin
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: primesieve
Description: Fast C/C++ prime number generator
Version: 6.3
Libs: -L${libdir} -lprimesieve
Libs.private: -lpthread
Cflags: -I${includedir}
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