I'm getting the following warnings from aclocal 1.9.4 when it runs through libmovtar 0.1.3-r1: /usr/share/aclocal/movtar.m4:14: warning: underquoted definition of MOVTAR_TEST_VERSION /usr/share/aclocal/movtar.m4:59: warning: underquoted definition of AM_PATH_MOVTAR
*** This bug has been marked as a duplicate of 89894 ***
again, devs should fix their packages, not just mark as a dupe, especially when each warning can be fixed with a 1 line changed patch
if you want an example, just see this patch: http://viewcvs.gentoo.org/media-libs/smpeg/files/smpeg-0.4.4-m4.patch
Fixed in cvs.