ack/first/get_sysvax

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#!/bin/sh
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while :
do
echo $E_FLAG "Which system-call library do you want to install for the VAX?
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You can choose between
libbsd4_1a for Berkeley Unix 4.1
libbsd4_2 for Berkeley Unix 4.2 or newer, or Ultrix
libsysV_2 for Unix System V
Your choice: [$SYSVAX] $E_SFX"
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. $FDIR/get_answer
case $ANS in
'') ANS="$SYSVAX";;
esac
SYSVAX="$ANS"
case $SYSVAX in
libbsd4_1a|libbsd4_2|libsysV_2)
break
;;
*) echo "I do not understand your answer ($SYSVAX). Try again"
;;
esac
done