/usr/share/pkgconfig/fixesproto.pc is in x11proto-fixes-dev 1:5.0-2.
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
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: FixesProto
Description: X Fixes extension headers
Version: 5.0
Cflags: -I${includedir}
Requires: xextproto >= 7.0.99.1
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