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Added back AC_PREREQ() to configure.in to work around the Debian/Ubuntu's autoconf wrapper which chooses the correct autoconf if AC_PREREQ is in the configure.in but chooses autoconf-2.13 for configure.in if AC_PREREQ is absent. The check in maint/updatefiles can't tell if the autoconf is wrapper or not. [svn breadcrumb: r5402 @ https://svn.mcs.anl.gov/repos/mpi/tools/mpe2]
b9184610