/usr/lib/x86_64-linux-gnu/pkgconfig/libsecp256k1.pc is in libsecp256k1-dev 0.1~20170810-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libsecp256k1
Description: Optimized C library for EC operations on curve secp256k1
URL: https://github.com/bitcoin-core/secp256k1
Version: 0.1
Cflags: -I${includedir}
Libs.private: -lgmp
Libs: -L${libdir} -lsecp256k1
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