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AC_DEFUN([st_SAVE_VAR], [dnl
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AS_IF([test -n "${$1+set}"], [st_saved_$1="${$1}"; unset $1])
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])
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AC_DEFUN([st_RESTORE_VAR], [dnl
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AS_IF([test -n "${st_saved_$1+set}"], [$1="${st_saved_$1}"; unset st_saved_$1])
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])
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