[arch-general] building vorbis-tools

vorbis-tools gives me the following error -> bsdtar -x -f vorbis-tools-1.2.0.tar.gz ==> Entering fakeroot environment... ==> Starting build()... aclocal.m4:14: error: this file was generated for autoconf 2.61. You have another version of autoconf. If you want to use that, you should regenerate the build system entirely. aclocal.m4:14: the top level autom4te: /usr/bin/m4 failed with exit status: 63 ==> ERROR: Build Failed. Aborting... autoconf is in the PKGBUILD file build() { cd $startdir/src/$pkgname-$pkgver autoconf ./configure --prefix=/usr --without-speex make || return 1 make DESTDIR=$startdir/pkg install } what could cause this error?