Add documentation for SPV file format.

[pspp] / acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
index 3e16c68879395e114d6c9a72027997d68aafe40f..292404723033bd06f84955e706b25aef2af96da9 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -303,3 +303,31 @@ AC_DEFUN([PSPP_ENABLE_WERROR],
         CFLAGS="$CFLAGS -Werror -Wno-error=deprecated-declarations"
       fi])])
 
+# The following comes from Open vSwitch:
+# ----------------------------------------------------------------------
+# Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+dnl Checks for dot.
+AC_DEFUN([PSPP_CHECK_DOT],
+  [AC_CACHE_CHECK(
+    [for dot],
+    [pspp_cv_dot],
+    [dnl "dot" writes -V output to stderr:
+     if (dot -V) 2>&1 | grep '^dot - [[gG]]raphviz version' >/dev/null 2>&1; then
+       pspp_cv_dot=yes
+     else
+       pspp_cv_dot=no
+     fi])
+   AM_CONDITIONAL([HAVE_DOT], [test "$pspp_cv_dot" = yes])])