document linux source build. add env variable script for linux src builds

README.md

@@ -79,10 +79,10 @@ To build OpenSCAD, you need some libraries and tools. The version
 numbers in brackets specify the versions which have been used for
 development. Other versions may or may not work as well.
 
-If you're using Ubuntu, you can install these libraries from
-aptitude. If you're using Mac, there is a build script that compiles
-the libraries from source. Follow the instructions for the platform
-you're compiling on below.
+If you're using a newer version of Ubuntu, you can install these 
+libraries from aptitude. If you're using Mac, or an older Linux, there 
+are build scripts that download and compile the libraries from source. 
+Follow the instructions for the platform you're compiling on below.
 
 * [Qt4 (4.4 - 4.7)](http://www.qt.nokia.com/)
 * [CGAL (3.6 - 3.9)](http://www.cgal.org/)
@@ -117,15 +117,25 @@ compilation process.
 
 After that, follow the Compilation instructions below.
 
-### Building for Ubuntu
+### Building for older Linux or without root access
 
-If you have done this and want to contribute, fork the repo and
-contribute docs on how to build for windows!
+First, make sure that you have compiler tools (build-essential on ubuntu).
+Then after you've cloned this git repository, run the script that sets up the
+environment variables.
+
+    source ./scripts/setenv-linbuild.sh
+
+Then run the script to download & compile all the prerequisite libraries above:
+
+    ./scripts/linux-build-dependencies.sh
+
+After that, follow the Compilation instructions below.
 
 ### Building for Windows
 
-If you have done this and want to contribute, fork the repo and
-contribute docs on how to build for windows!
+OpenSCAD for Windows is usually cross-compiled from Linux. If you wish to
+attempt an MSVC build, please see this site:
+http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Building_on_Windows
 
 ### Compilation
 

scripts/linux-build-dependencies.sh

@@ -7,12 +7,9 @@
 # Usage: linux-build-dependencies.sh
 #
 # Prerequisites:
-# - curl
-# -- you can uncomment 'build_curl' at the bottom
-# -- and add $BASEDIR/bin to your PATH, i.e. in .bash_profile
+# - wget
 # - Qt4
-# - cmake 2.8 
-# -- you can uncomment 'build_cmake' at the bottom
+# - cmake 2.8 ( force build_cmake at bottom if yours is too old )
 #
 
 BASEDIR=$HOME/openscad_deps
@@ -209,9 +206,9 @@ mkdir -p $SRCDIR $DEPLOYDIR
 export PATH=$BASEDIR/bin:$PATH
 export LD_LIBRARY_PATH=$DEPLOYDIR/lib:$DEPLOYDIR/lib64:$LD_LIBRARY_PATH
 export LD_RUN_PATH=$DEPLOYDIR/lib:$DEPLOYDIR/lib64:$LD_RUN_PATH
-echo "PATH modified"
-echo "LD_LIBRARY_PATH modified"
-echo "LD_RUN_PATH modified"
+echo "PATH modified temporarily"
+echo "LD_LIBRARY_PATH modified temporarily"
+echo "LD_RUN_PATH modified temporarily"
 
 if [ ! "`command -v curl`" ]; then
 	build_curl 7.26.0
@@ -232,8 +229,3 @@ build_glew 1.7.0
 build_opencsg 1.3.2
 
 echo "OpenSCAD dependencies built in " $BASEDIR
-echo "To build OpenSCAD, copy/paste these lines to your shell prompt: "
-echo "export LD_LIBRARY_PATH=$DEPLOYDIR/lib:$DEPLOYDIR/lib64"
-echo "GLEWDIR=$DEPLOYDIR OPENSCAD_LIBRARIES=$DEPLOYDIR qmake-qt4"
-echo "make -j$NUMCPU"
-

scripts/setenv-linbuild.sh

@@ -0,0 +1,16 @@
+# BASEDIR and DEPLOYDIR must be the same as in linux-build-dependencies.sh
+BASEDIR=$HOME/openscad_deps
+DEPLOYDIR=$BASEDIR
+
+PATH=$BASEDIR/bin:$PATH
+LD_LIBRARY_PATH=$DEPLOYDIR/lib:$DEPLOYDIR/lib64
+LD_RUN_PATH=$DEPLOYDIR/lib:$DEPLOYDIR/lib64
+OPENSCAD_LIBRARIES=$DEPLOYDIR
+GLEWDIR=$DEPLOYDIR
+
+echo PATH modified
+echo LD_LIBRARY_PATH modified
+echo LD_RUN_PATH modified
+echo OPENSCAD_LIBRARIES modified
+echo GLEWDIR modified
+