From 4718b9dc0759b4a18356725cc05ffaa651215b66 Mon Sep 17 00:00:00 2001
From: durk <durk>
Date: Sat, 1 Sep 2007 12:55:46 +0000
Subject: [PATCH] Added a check for OpenSceneGraph and created some basic
 documentation.

---
 Makefile.am  |  1 +
 README.OSG   | 24 ++++++++++++++++++++++++
 configure.ac | 12 ++++++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 README.OSG

diff --git a/Makefile.am b/Makefile.am
index 4c0bf037..a57c42b3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6,6 +6,7 @@ EXTRA_DIST = \
 	README.zlib \
 	README.plib \
 	README.OpenAL \
+	README.OSG \
 	projects \
 	SimGear.dsp \
 	SimGear.dsw
diff --git a/README.OSG b/README.OSG
new file mode 100644
index 00000000..5cef509f
--- /dev/null
+++ b/README.OSG
@@ -0,0 +1,24 @@
+[This file is mirrored in both the FlightGear and SimGear packages.]
+
+You *must* have OpenSceneGraph (OSG) installed to build this version of 
+FlightGear.
+
+You can get the latest version of OSG from:
+
+http://www.openscenegraph.org/
+
+Build notes:
+
+Unzip the file OpenSceneGraph-2.0.zip and install using the following
+commands:
+
+unzip OpenSceneGraph-2.0
+cd OpenSceneGraph
+ccmake .
+
+[ While running ccmake: press 'c' to configure, press 'c' once more, and
+  then press 'g' to generate and exit ]
+
+make 
+sudo make install
+
diff --git a/configure.ac b/configure.ac
index 23bfb03e..41c24f55 100644
--- a/configure.ac
+++ b/configure.ac
@@ -386,6 +386,18 @@ int main() {
 
 LIBS="$saved_LIBS"
 
+AC_CHECK_HEADER(osg/Version)
+if test "x$ac_cv_header_osg_Version" != "xyes"; then
+    echo
+    echo "You *must* have the OpenSceneGraph support library installed on your system"
+    echo "to build the FGFS simulator!"
+    echo
+    echo "Please see README.OSG for more details."
+    echo
+    echo "configure aborted."
+    exit
+fi
+
 AC_LANG_POP
 
 dnl Check for system installed zlib
-- 
2.39.5