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AC_DEFUN([EXPAND],
[
EXP_VAR=[$1]
FROM_VAR=[$2]
dnl first expand prefix and exec_prefix if necessary
prefix_save=$prefix
exec_prefix_save=$exec_prefix
# normally, this is done automatically first when running AC_OUTPUT, but we need them expanded now
test "x$prefix" = xNONE && prefix=$ac_default_prefix
# Let make expand exec_prefix.
test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
full_var="$FROM_VAR"
dnl loop until it doesn"t change anymore
while true; do
new_full_var="`eval echo $full_var`"
if test "x$new_full_var" = "x$full_var"; then break; fi
full_var=$new_full_var
done
dnl clean up
full_var=$new_full_var
AC_SUBST([$1], "$full_var")
dnl restore prefix and exec_prefix
prefix=$prefix_save
exec_prefix=$exec_prefix_save
])
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