/usr/lib/x86_64-linux-gnu/pkgconfig/claws-mail.pc is in libclaws-mail-dev 3.16.0-1.
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 11 12 13 14 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
pkglibdir=${libdir}/claws-mail
pkgincludedir=${includedir}/claws-mail
plugindir=${pkglibdir}/plugins
Name: Claws Mail
Description: Claws Mail
Version: 3.16.0.0
Cflags: -I${pkgincludedir}/common -I${pkgincludedir}/gtk -pthread -I/usr/include/enchant -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I${pkgincludedir}
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