diff --git a/net-snmp-create-v3-user.in b/net-snmp-create-v3-user.in
index 19895a1..ac3c60f 100644
--- a/net-snmp-create-v3-user.in
+++ b/net-snmp-create-v3-user.in
@@ -14,6 +14,10 @@ Xalgorithm="DES"
 token=rwuser

 while test "x$done" = "x" -a "x$1" != "x" -a "x$usage" != "xyes"; do
+case "$1" in
+    -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
+    *) optarg= ;;
+esac

 unset shifted
 case $1 in
@@ -134,11 +138,9 @@ if test ! -d "$outfile"; then
     touch "$outfile"
 fi
 echo "$line" >> "$outfile"
-prefix=@prefix@
-datarootdir=@datarootdir@
-# To suppress shellcheck complaints about $prefix and $datarootdir.
-: "$prefix" "$datarootdir"
-outfile="@datadir@/snmp/snmpd.conf"
+# Avoid that configure complains that this script ignores @datarootdir@
+echo "@datarootdir@" >/dev/null
+outfile="/etc/snmp/snmpd.conf"
 line="$token $user"
 echo "adding the following line to $outfile:"
 echo "   $line"