--- configure.src.orig	2019-12-06 10:29:10 UTC
+++ configure.src
@@ -49,7 +49,7 @@ skip_applications=
 while test $# != 0; do
     case $1 in
 	-srcdir=* | --srcdir=*)
-	    user_srcdir=`expr "$1" : '[^=]*=\(.*\)'`
+	    user_srcdir=`expr -- "$1" : '[^=]*=\(.*\)'`
 	    if test "$ERL_TOP" != ""; then
 		echo "WARNING: Overriding ERL_TOP with $user_srcdir" 1>&2
 		echo "" 1>&2
@@ -89,7 +89,7 @@ while test $# != 0; do
 	    echo "" 1>&2
 	    ;;
 	-cache-file=* | --cache-file=* )
-	    static_cache=`expr "$1" : '[^=]*=\(.*\)'`
+	    static_cache=`expr -- "$1" : '[^=]*=\(.*\)'`
 	    if test "$static_cache" != "/dev/null"; then
 		echo "WARNING: Only using config cache file '$static_cache' as static cache" 1>&2
 		echo "" 1>&2
@@ -126,8 +126,8 @@ while test $# != 0; do
 		mXY_build=
 	    fi;;
 	CFLAGS=* | LDFLAGS=*)
-	    flgs_var=`expr "$1" : '\([^=]*\)=.*'`
-	    flgs_val=`expr "$1" : '[^=]*=\(.*\)'`
+	    flgs_var=`expr -- "$1" : '\([^=]*\)=.*'`
+	    flgs_val=`expr -- "$1" : '[^=]*=\(.*\)'`
 	    eval $flgs_var=\$flgs_val
 	    ;;
 	--help=r* | -help=r*)
@@ -137,7 +137,7 @@ while test $# != 0; do
         *)
 	    case $1 in
 		--without-*)
-		    skip_app=`expr "$1" : '--without-\(.*\)'`
+		    skip_app=`expr -- "$1" : '--without-\(.*\)'`
 		    if test -d "lib/$skip_app"; then
 			skip_applications="$skip_applications $skip_app"
 		    fi;;