acinclude.m4 has a workaround for AC_PROG_SED when using older versions of autoconf ... unfortunately, this workaround breaks things when newer autoconf is used (like 2.62).
the fix is to use the standard name of "AC_PROG_SED", but only define it when it isnt available automatically. patch attached.
urjtag-sed-autoconf.patch
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Thanks! Committed as revision 1173.