This is a fatal error of an ebuild versions of autoconf >= 2.53 (like anything recent). Old versions of autoconf should work. 'emerge xvattr' gives the following error: !!! ERROR: media-video/xvattr-1.3-r1 failed. Call stack: ebuild.sh, line 1539: Called dyn_unpack ebuild.sh, line 711: Called src_unpack xvattr-1.3-r1.ebuild, line 35: Called eautoreconf autotools.eclass, line 62: Called eautoconf autotools.eclass, line 132: Called autotools_run_tool 'autoconf' autotools.eclass, line 188: Called die !!! Failed Running autoconf ! !!! If you need support, post the topmost build error, and the call stack if relevant. The contents of the file '/var/tmp/portage/xvattr-1.3-r1/temp/autoconf-23449.out' are as follows: configure.in:10: error: do not use LIBOBJS directly, use AC_LIBOBJ (see section `AC_LIBOBJ vs LIBOBJS' If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation.
Works just fine here. sys-devel/autoconf: 2.13, 2.60