/usr/share/pkgconfig/spice-protocol.pc is in libspice-protocol-dev 0.12.12-1.
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 | prefix=/usr
includedir=${prefix}/include
datadir=${prefix}/share
Name: spice-protocol
Description: SPICE protocol headers
Version: 0.12.12
Libs:
Cflags: -I${includedir}/spice-1
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