#1 autoconf generates errors and does not compile config.h

Trying to compile the latest (2.6.1) on Linux Mint, and I keep getting these errors:

% autoconf
configure.ac:68: error: possibly undefined macro: AC_MSG_ERROR
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure.ac:76: error: possibly undefined macro: AM_CONFIG_HEADER
configure.ac:77: error: possibly undefined macro: AM_INIT_AUTOMAKE
configure.ac:83: error: possibly undefined macro: AC_SUBST
configure.ac:110: error: possibly undefined macro: AM_PROG_CC_C_O
configure.ac:111: error: possibly undefined macro: AC_DISABLE_STATIC
configure.ac:112: error: possibly undefined macro: AC_PROG_LIBTOOL
configure.ac:115: error: possibly undefined macro: AC_PROG_INTLTOOL
configure.ac:125: error: possibly undefined macro: AC_CHECK_LIB
configure.ac:129: error: possibly undefined macro: AC_DEFINE
configure.ac:136: error: possibly undefined macro: AC_MSG_RESULT
configure.ac:148: error: possibly undefined macro: AM_GLIB_GNU_GETTEXT
configure.ac:643: error: possibly undefined macro: AM_CONDITIONAL
configure.ac:738: error: possibly undefined macro: AC_MSG_WARN
configure.ac:750: error: possibly undefined macro: AM_GCONF_SOURCE_2
configure.ac:1589: error: possibly undefined macro: AC_PROG_PERL_MODULES
configure.ac:2365: error: possibly undefined macro: AC_VAR_TIMEZONE_EXTERNALS

config.h.in is not being compiled, and the generated configure script fails because of this.

Carrier previously compiled with version 2.5.7, so I'm not sure why this one is having trouble.