Use proper syntax in test.

git-svn-id: https://svn.dealii.org/trunk@22975 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/doc/doxygen/Makefile.in b/deal.II/doc/doxygen/Makefile.in
index d6fddb2e49a1491aa0d38bc595a53aa9a04443be..a6c11ef20ab6729f298a04bbf466d31653845630 100644 (file)
--- a/deal.II/doc/doxygen/Makefile.in
+++ b/deal.II/doc/doxygen/Makefile.in
@@ -39,7 +39,7 @@ deal.II deal.tag: tutorial \
          $(addprefix tutorial/doxygen/, $(shell ls tutorial/doxygen/))
        @echo "=== Generating reference documentation. " \
               "This can take several minutes..."
-       @if test -n -d deal.II ; then mkdir deal.II ; fi
+       @if test ! -d deal.II ; then mkdir deal.II ; fi
        cat @DOXYGEN_OPTIONS@ deal.dox | @DOXYGEN@ - > doxygen.log
        @if test -f deal.II/step__1.html ; then \
           for i in deal.II/*__*html ; do \