build with autotools failed on ubuntu16.04

[leleliu008]

Host OS:

ubuntu16.04

Installed softwares:

automake (GNU automake) 1.15
autoconf (GNU Autoconf) 2.69
libtool (GNU libtool) 2.4.6
GNU Make 4.1

reproduce steps:

git clone https://github.com/sass/libsass
cd libsass
autoreconf -ivf

report logs:

autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force
autoreconf: configure.ac: tracing
autoreconf: configure.ac: not using Libtool
autoreconf: running: /usr/bin/autoconf --force
autoreconf: running: /usr/bin/autoheader --force
autoreconf: running: automake --add-missing --copy --force-missing
configure.ac:30: installing 'script/ar-lib'
configure.ac:19: installing 'script/compile'
configure.ac:15: installing 'script/install-sh'
configure.ac:15: installing 'script/missing'
GNUmakefile.am:37: warning: source file '$(SASS_SASSC_PATH)/sassc.c' is in a subdirectory,
GNUmakefile.am:37: but option 'subdir-objects' is disabled
automake: warning: possible forward-incompatibility.
automake: At least a source file is in a subdirectory, but the 'subdir-objects'
automake: automake option hasn't been enabled.  For now, the corresponding output
automake: object file(s) will be placed in the top-level directory.  However,
automake: this behaviour will change in future Automake versions: they will
automake: unconditionally cause object files to be placed in the same subdirectory
automake: of the corresponding sources.
automake: You are advised to start using 'subdir-objects' option throughout your
automake: project, to avoid future incompatibilities.
GNUmakefile.am: installing 'script/depcomp'
parallel-tests: installing 'script/test-driver'
src/GNUmakefile.am:27: error: Libtool library used but 'LIBTOOL' is undefined
src/GNUmakefile.am:27:   The usual way to define 'LIBTOOL' is to add 'LT_INIT'
src/GNUmakefile.am:27:   to 'configure.ac' and run 'aclocal' and 'autoconf' again.
src/GNUmakefile.am:27:   If 'LT_INIT' is in 'configure.ac', make sure
src/GNUmakefile.am:27:   its definition is in aclocal's search path.
Makefile.conf:92: warning: source file 'memory/allocator.cpp' is in a subdirectory,
Makefile.conf:92: but option 'subdir-objects' is disabled
src/GNUmakefile.am:29:   'Makefile.conf' included from here
Makefile.conf:92: warning: source file 'memory/shared_ptr.cpp' is in a subdirectory,
Makefile.conf:92: but option 'subdir-objects' is disabled
src/GNUmakefile.am:29:   'Makefile.conf' included from here
autoreconf: automake failed with exit status: 1