CONFIG: add config files for VTK, MESA

- sometimes used for off-screen rendering.
  Only add to library-path when they are actually available

etc/config.sh/paraview

@@ -119,7 +119,7 @@ then
 
     export ParaView_DIR=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$pvName
 
-    # Set paths if binaries or source are present
+    # Set paths if binaries are present
     if [ -r $ParaView_DIR ]
     then
         pvLibDir=$ParaView_DIR/lib/$pvMajor

etc/config.sh/unset

@@ -120,6 +120,7 @@ unset ParaView_INCLUDE_DIR
 unset ParaView_MAJOR
 unset ParaView_VERSION
 unset PV_PLUGIN_PATH
+unset VTK_DIR
 
 #------------------------------------------------------------------------------
 # unset other ThirdParty environment variables
@@ -132,6 +133,7 @@ unset FFTW_ARCH_PATH
 unset GPERFTOOLS_ARCH_PATH
 unset GMP_ARCH_PATH
 unset MPFR_ARCH_PATH
+unset MESA_ARCH_PATH
 unset METIS_ARCH_PATH
 unset SCOTCH_ARCH_PATH
 

etc/config.sh/vtk

@@ -0,0 +1,72 @@
+#----------------------------------*-sh-*--------------------------------------
+# =========                 |
+# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+#  \\    /   O peration     |
+#   \\  /    A nd           | Copyright (C) 2016 OpenCFD Ltd.
+#    \\/     M anipulation  |
+#------------------------------------------------------------------------------
+# License
+#     This file is part of OpenFOAM.
+#
+#     OpenFOAM is free software: you can redistribute it and/or modify it
+#     under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+#
+#     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+#     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+#     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+#     for more details.
+#
+#     You should have received a copy of the GNU General Public License
+#     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+#
+# File
+#     etc/config.sh/vtk
+#
+# Description
+#     Setup file for VTK (and MESA)
+#     Sourced from OpenFOAM-<VERSION>/etc/bashrc
+#
+#     The library path is not adjusted with the paths specified here do not exist
+#
+# Note
+#     When _foamAddLib is unset
+#         - the vtk_version, mesa_version variables are retained.
+#------------------------------------------------------------------------------
+
+vtk_version=VTK-7.1.0
+mesa_version=mesa-13.0.1
+
+export VTK_DIR=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$vtk_version
+export MESA_ARCH_PATH=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$mesa_version
+
+#------------------------------------------------------------------------------
+if [ "$FOAM_VERBOSE" -a "$PS1" ]
+then
+    echo "Using vtk  ($vtk_version)  ->  $VTK_ARCH_PATH" 1>&2
+    echo "Using mesa ($mesa_version)  ->  $MESA_ARCH_PATH" 1>&2
+fi
+
+if type _foamAddLib > /dev/null 2>&1    # normal sourcing
+then
+
+    # Set paths if binaries are present
+    if [ -r $VTK_DIR ]
+    then
+        _foamAddLib $VTK_DIR/lib$WM_COMPILER_LIB_ARCH
+    else
+        unset VTK_DIR
+    fi
+
+    if [ -r $MESA_ARCH_PATH ]
+    then
+        _foamAddLib $MESA_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH
+    else
+        unset MESA_ARCH_PATH
+    fi
+
+    unset vtk_version mesa_version
+fi
+
+#------------------------------------------------------------------------------