From c5c2640f584ae68604c542cd92069ea3b8fc1593 Mon Sep 17 00:00:00 2001
From: Don Pellegrino <don@coffee.donpellegrino.com>
Date: Wed, 09 Sep 2009 19:25:26 +0000
Subject: Added dependency checking and error messages to the configure.ac

script while leaving the README more general.
---
diff --git a/README b/README
index b03724f..b564016 100644
--- a/README
+++ b/README
@@ -27,16 +27,17 @@ selection mechanisms can be used to identify the points under the
 mouse.  Alternatively a keyboard command might be added to provide the
 information upon a keypress.
 
-===
-DB2
-===
+See configure.ac for a list of build dependencies.
 
-  export LDFLAGS="-L/home/db2inst1/sqllib/lib"
-  export CFLAGS="-I/home/db2inst1/sqllib/include"
+=====================================
+Example: Building on a Debian system.
+=====================================
 
-======================
-CLUSTER.CIS.DREXEL.EDU
-======================
+The following Debian packages are used for the build process.
 
-This project will not build on cluster as the OpenGL support libraries
-there do not include support for buffer objects.
+libtool
+
+To setup the build tools run:
+
+$ libtoolize
+$ autoreconf
diff --git a/configure.ac b/configure.ac
index 4e0c4ba..fa1de7a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,14 +7,38 @@ AC_CONFIG_FILES([
 	src/Makefile
 ])
 
+##################
+# MODULE: OpenGL #
+##################
+
+# Note that this project will not build on systems where the OpenGL
+# support libraries do not include support for buffer objects.
+
 # Check for OpenGL libraries GLUT, GLU and GL.  OpenGL is used for the
 # visualization rendering and interaction.
 AX_CHECK_GLUT
 
-# Check for DB2.
-AC_SEARCH_LIBS([sqlastrt],[db2])
+###############
+# MODULE: DB2 #
+###############
+
+# Check for DB2 client library.
+AC_SEARCH_LIBS([sqlastrt],[db2],[],
+[AC_MSG_ERROR(The DB2 client libraries are needed to build the system. After installation of the client it may be necessary to add -L/home/db2inst1/sqllib/lib to LDFLAGS.)])
+
+# Check for DB2 client headers.
+AC_CHECK_HEADERS([sqladef.h],[],
+[AC_MSG_ERROR(The DB2 client headers are needed to build the system. After installation of the client it may be necessary to add -I/home/db2inst1/sqllib/include to CPPFLAGS.)])
+
+##########################
+# MODULE: BROWSER PLUGIN #
+##########################
 
 # Libtool is used to build the library for the browser plugin.
 AC_PROG_LIBTOOL
 
+# Check for the Gecko Plugin API
+AC_CHECK_HEADERS([npapi.h],[],
+[AC_MSG_ERROR(The Gecko Plugin API (NPAPI) is needed to build the system. Information on this API can be found on-line at https://developer.mozilla.org/en/Plugins. Debian users can add the package xulrunner-dev and add -I/usr/include/xulrunner-1.9/unstable to CPPFLAGS.)])
+
 AC_OUTPUT
--
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