/usr/lib/x86_64-linux-gnu/pkgconfig/vibe-crypto.pc is in libvibe-crypto-dev 0.8.2-1build1.
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
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: vibe-crypto
Description: Cryptographic helper routines for Vibe.
Version: 0.8.2
Requires: vibe-utils vibe-core
Libs: -L${libdir} -lvibe-crypto
Cflags: -I${includedir}/d/vibe
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