sparsehash-2.0.4$ ./autogen.sh
+ rm -rf autom4te.cache
+ aclocal --force -I m4
+ autoconf -f -W all,no-obsolete
+ autoheader -f -W all
+ automake -a -c -f -W all
configure.ac:16: installing './compile'
Makefile.am:156: warning: source file 'src/hashtable_test.cc' is in a subdirectory,
Makefile.am:156: 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.
Makefile.am:140: warning: source file 'src/libc_allocator_with_realloc_test.cc' is in a subdirectory,
Makefile.am:140: but option 'subdir-objects' is disabled
Makefile.am:172: warning: source file 'src/simple_compat_test.cc' is in a subdirectory,
Makefile.am:172: but option 'subdir-objects' is disabled
Makefile.am:166: warning: source file 'src/simple_test.cc' is in a subdirectory,
Makefile.am:166: but option 'subdir-objects' is disabled
Makefile.am:148: warning: source file 'src/sparsetable_unittest.cc' is in a subdirectory,
Makefile.am:148: but option 'subdir-objects' is disabled
Makefile.am:125: warning: source file 'src/template_util_unittest.cc' is in a subdirectory,
Makefile.am:125: but option 'subdir-objects' is disabled
Makefile.am:179: warning: source file 'src/time_hash_map.cc' is in a subdirectory,
Makefile.am:179: but option 'subdir-objects' is disabled
Makefile.am:132: warning: source file 'src/type_traits_unittest.cc' is in a subdirectory,
Makefile.am:132: but option 'subdir-objects' is disabled