/usr/include/ is in libguytools1-dev 1.1.1-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libguytools1/
/usr/include/libguytools1/cfg/
/usr/include/libguytools1/cfg/toolcfg.h
/usr/include/libguytools1/error/
/usr/include/libguytools1/error/toolerror.h
/usr/include/libguytools1/log/
/usr/include/libguytools1/log/toollog.h
/usr/include/libguytools1/signal/
/usr/include/libguytools1/signal/toolsignal.h
/usr/include/libguytools1/sysinfo/
/usr/include/libguytools1/sysinfo/toolsysinfo.h
/usr/include/libguytools1/toolconstants.h
/usr/include/libguytools1/toolglobalid.h
/usr/include/libguytools1/tooltarget.h
/usr/include/libguytools1/tooltypes.h