diff --git a/tools/xsltproc.sh b/tools/xsltproc.sh
index d34ec7b..edee324 100755
--- a/tools/xsltproc.sh
+++ b/tools/xsltproc.sh
@@ -24,11 +24,14 @@ XSLTPROC="xsltproc --nonet"
 #functions
 #main
 clean=0
-while getopts "cP:" name; do
+while getopts "cO:P:" name; do
 	case "$name" in
 		c)
 			clean=1
 			;;
+		O)
+			export "${OPTARG%%=*}"="${OPTARG#*=}"
+			;;
 		P)
 			#XXX ignored
 			;;