/usr/ is in liblfunction-dev 1.23+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc/
/usr/share/doc/liblfunction-dev/
/usr/share/doc/liblfunction-dev/copyright
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/include/
/usr/include/Lfunction/
/usr/include/Lfunction/Lcommon_ld.h
/usr/include/Lfunction/Lglobals.h
/usr/include/Lfunction/Lgamma.h
/usr/include/Lfunction/Lgmpfrxx.h
/usr/include/Lfunction/Lfind_zeros.h
/usr/include/Lfunction/Lgram.h
/usr/include/Lfunction/Lnumberzeros.h
/usr/include/Lfunction/Ldirichlet_series.h
/usr/include/Lfunction/Lprint.h
/usr/include/Lfunction/Lriemannsiegel.h
/usr/include/Lfunction/Lexplicit_formula.h
/usr/include/Lfunction/Lmisc.h
/usr/include/Lfunction/Lcommon.h
/usr/include/Lfunction/Lvalue.h
/usr/include/Lfunction/mpfr_mul_d.h
/usr/include/Lfunction/L.h
/usr/include/Lfunction/Ldokchitser.h
/usr/include/Lfunction/Lriemannsiegel_blfi.h
/usr/include/Lfunction/Lcomplex.h
/usr/share/doc/liblfunction-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libLfunction.so