/usr/ is in libltdl-dev 2.4.2-1.7ubuntu1.
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..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libltdl.a
/usr/lib/x86_64-linux-gnu/libltdl.la
/usr/include/
/usr/include/libltdl/
/usr/include/libltdl/lt_dlloader.h
/usr/include/libltdl/lt_system.h
/usr/include/libltdl/lt_error.h
/usr/include/ltdl.h
/usr/share/
/usr/share/libtool/
/usr/share/libtool/libltdl/
/usr/share/libtool/libltdl/lt__dirent.c
/usr/share/libtool/libltdl/lt_error.c
/usr/share/libtool/libltdl/configure.ac
/usr/share/libtool/libltdl/aclocal.m4
/usr/share/libtool/libltdl/Makefile.inc
/usr/share/libtool/libltdl/loaders/
/usr/share/libtool/libltdl/loaders/dyld.c
/usr/share/libtool/libltdl/loaders/preopen.c
/usr/share/libtool/libltdl/loaders/dld_link.c
/usr/share/libtool/libltdl/loaders/loadlibrary.c
/usr/share/libtool/libltdl/loaders/dlopen.c
/usr/share/libtool/libltdl/loaders/load_add_on.c
/usr/share/libtool/libltdl/loaders/shl_load.c
/usr/share/libtool/libltdl/lt_dlloader.c
/usr/share/libtool/libltdl/lt__strl.c
/usr/share/libtool/libltdl/lt__alloc.c
/usr/share/libtool/libltdl/config-h.in
/usr/share/libtool/libltdl/ltdl.c
/usr/share/libtool/libltdl/README
/usr/share/libtool/libltdl/libltdl/
/usr/share/libtool/libltdl/libltdl/lt__dirent.h
/usr/share/libtool/libltdl/libltdl/slist.h
/usr/share/libtool/libltdl/libltdl/lt_dlloader.h
/usr/share/doc/libltdl-dev
/usr/share/libtool/libltdl/libltdl/lt_system.h
/usr/share/libtool/libltdl/libltdl/lt__private.h
/usr/share/libtool/libltdl/libltdl/lt_error.h
/usr/share/libtool/libltdl/libltdl/lt__strl.h
/usr/share/libtool/libltdl/libltdl/lt__alloc.h
/usr/share/libtool/libltdl/libltdl/lt__glibc.h
/usr/share/libtool/libltdl/configure
/usr/share/libtool/libltdl/COPYING.LIB
/usr/share/libtool/libltdl/Makefile.am
/usr/share/libtool/libltdl/argz_.h
/usr/share/libtool/libltdl/Makefile.in
/usr/share/libtool/libltdl/argz.c
/usr/share/libtool/libltdl/ltdl.h
/usr/share/libtool/libltdl/slist.c
/usr/share/aclocal/
/usr/share/aclocal/ltdl.m4
/usr/share/doc/
/usr/lib/x86_64-linux-gnu/libltdl.so