/usr/lib/x86_64-linux-gnu/pkgconfig/pixman-1.pc is in libpixman-1-dev 0.30.2-2ubuntu1.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Pixman
Description: The pixman library (version 1)
Version: 0.30.2
Cflags: -I${includedir}/pixman-1
Libs: -L${libdir} -lpixman-1
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