AC_PROG_MKDIR_P
AC_CHECK_PROGS([LEX],['flex'],[:])
AC_CHECK_PROGS([YACC],['bison --warnings=all'],[:])
-AX_PROG_SPHINX_BUILD
+AX_PROG_SPHINX_BUILD(,[AC_MSG_ERROR([sphinx-build version 1.0 or greater is required])])
AX_PROG_MEMCACHED
# Checks for libraries.