fix m4 quoting

diff --git a/m4/rtai.m4 b/m4/rtai.m4
index 7da6c7ac13f56a445ab3c60727aa4ec5a38eb089..04db3634779da13d6985222be9deba97e8a4e5b5 100644 (file)
--- a/m4/rtai.m4
+++ b/m4/rtai.m4
@@ -14,7 +14,7 @@ AC_DEFUN([DS_RTAI],
                if [[ -d ${RTAI_DIR}/include ]] ; then
                        RTAI_CFLAGS="-I${RTAI_DIR}/include"
                else
-                       if [ -d ${RTAI_DIR}/rtai-core/include ] ; then
+                       if [[ -d ${RTAI_DIR}/rtai-core/include ]] ; then
                                RTAI_CFLAGS="-I${RTAI_DIR}/rtai-core/include"
                        else
                                AC_MSG_ERROR([incorrect RTAI directory?])