Put variable into "..." to avoid a warning in case the value is empty.

git-svn-id: https://svn.dealii.org/trunk@5640 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/aclocal.m4 b/deal.II/aclocal.m4
index ddbba9bad37f35bc286a76950d06e756fc9c95d7..fa8123e92d786e11dc2c03f3fb73fbd7df1b131e 100644 (file)
--- a/deal.II/aclocal.m4
+++ b/deal.II/aclocal.m4
@@ -1801,8 +1801,8 @@ AC_DEFUN(DEAL_II_CONFIGURE_TECPLOT, dnl
   AC_CHECK_FILE($TEC90HOME/include/TECIO.h,
                TECPLOT_INCLUDE_PATH=$TEC90HOME/include)
 
-  if (test -r $TECPLOT_LIBRARY_PATH && \
-      test -r $TECPLOT_INCLUDE_PATH/TECIO.h) ; then
+  if (test -r "$TECPLOT_LIBRARY_PATH" && \
+      test -r "$TECPLOT_INCLUDE_PATH/TECIO.h") ; then
     AC_DEFINE(DEAL_II_HAVE_TECPLOT, 1,
              [Flag indicating whether the library shall be compiled to use the Tecplot interface])
   fi