/usr/lib/x86_64-linux-gnu/pkgconfig/ctpl.pc is in libctpl-dev 0.3.3.dfsg-4.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: CTPL
Description: C Template (Parser) Library
Version: 0.3.3
Requires: glib-2.0 gio-2.0
Libs: -L${libdir} -lctpl
Libs.private: -lm
Cflags: -I${includedir}
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