/usr/lib/x86_64-linux-gnu/pkgconfig/xcomposite.pc is in libxcomposite-dev 1:0.4.4-2.
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 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Xcomposite
Description: X Composite Extension Library
Version: 0.4.4
Requires: xproto compositeproto >= 0.4
Requires.private: x11 xfixes
Cflags: -I${includedir}
Libs: -L${libdir} -lXcomposite
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