/usr/ is in libctpl-dev 0.3.4+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/ctpl/
/usr/include/ctpl/ctpl-environ.h
/usr/include/ctpl/ctpl-eval.h
/usr/include/ctpl/ctpl-input-stream.h
/usr/include/ctpl/ctpl-io.h
/usr/include/ctpl/ctpl-lexer-expr.h
/usr/include/ctpl/ctpl-lexer.h
/usr/include/ctpl/ctpl-output-stream.h
/usr/include/ctpl/ctpl-parser.h
/usr/include/ctpl/ctpl-token.h
/usr/include/ctpl/ctpl-value.h
/usr/include/ctpl/ctpl-version.h
/usr/include/ctpl/ctpl.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/ctpl.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libctpl-dev/
/usr/share/doc/libctpl-dev/copyright
/usr/lib/x86_64-linux-gnu/libctpl.so
/usr/share/doc/libctpl-dev/changelog.Debian.gz