working on sctp

configure

@@ -1162,13 +1162,23 @@ fi
 ###############################
 
 if [ -z "${TURN_NO_SCTP}" ] ; then
+	if [ -z "${TURN_SCTP_INCLUDE}" ] ; then
+		if ! [ "${PREFIX}" = "/usr" ] ; then
+			if ! [ "${PREFIX}" = "/usr/local" ] ; then
+				TURN_SCTP_INCLUDE=`find ${PREFIX}/include/ -name sctp.h`
+			fi
+		fi
+	fi
+	if [ -z "${TURN_SCTP_INCLUDE}" ] ; then
+		TURN_SCTP_INCLUDE=`find /usr/local/include/ -name sctp.h`
+	fi
 	if [ -z "${TURN_SCTP_INCLUDE}" ] ; then
 		TURN_SCTP_INCLUDE=`find /usr/include/ -name sctp.h`
-    	if [ -z "${TURN_SCTP_INCLUDE}" ] ; then
-			TURN_NO_SCTP="-DTURN_NO_SCTP"
-		else
-			TURN_SCTP_INCLUDE="-DTURN_SCTP_INCLUDE=\"\\\"${TURN_SCTP_INCLUDE}\\\"\""
-    	fi
+	fi
+    if [ -z "${TURN_SCTP_INCLUDE}" ] ; then
+		TURN_NO_SCTP="-DTURN_NO_SCTP"
+	else
+		TURN_SCTP_INCLUDE="-DTURN_SCTP_INCLUDE=\"\\\"${TURN_SCTP_INCLUDE}\\\"\""
     fi
 else
     TURN_NO_SCTP="-DTURN_NO_SCTP"