+== Building From Source ==
+1. C++ tool-chain. Supported compilers are gcc (g++) for Linux and Mac OS X and Microsoft Visual
+C++ on Windows (MinGW is not supported at this time). Clang also works for MAC OS, but see details below.
+* On Windows install the free [http://www.microsoft.com/express Visual Studio Express]
+* On Linux use the distribution package management tools
+* On Mac OSX install the [http://developer.apple.com/xcode XCode developer tools]
+You will also need python and numpy development header files. They are included in python
+and numpy installation on Windows and Mac OSX, but are in separate packages on Linux,
+for instance 'python-dev' and python-numpy-dev' on Debian derived distributions.
+=== Obtaining source ===
+* Download the latest nightly packed sources archive and unpack it.
+* Clone the Mercurial repository:
+ hg clone https://bitbucket.org/biolab/orange
+=== With setup.py (suggested) ===
+The easiest way to build Orange from source is to use the setup.py in the root
+Orange directory (requires administrative privileges). Just run:
+Alternatively, you could install Orange into the user specific site-packages
+You will need to add the install dir to PYTHONSITEPACKAGES environment variable
+(because Python needs to process Orange's .pth file)
+If clang is the default compiler it is necessary to add the `-Wno-address-of-temporary`
+flag to the CPPFLAGS environment variable before running setup.py:
+To install in development mode (http://packages.python.org/distribute/setuptools.html#development-mode)
+run the following command instead of "python setup.py install":
+ python setup.py develop
+This is only useful to developers of the C++ part (this can only build the extensions
+in-place and does not support an install command).
+First change the working directory to the 'source' sub-directory then run make:
+this will build the orange core extensions in the root directory (i.e. the one you started in).
+Useful environment variables:
+ * PYTHON - names the python executable for which Orange is being build.
+ * CXXFLAGS - flags to pass to C++ compiler
+ * CFLAGS - flags to pass to C compiler
+ * LDFLAGS - flags to pass to the linker
+ * EXCLUDE_ORANGEQT - if set to any value will cause orangeqt to not be build
+See source/orangeqt/README.txt for building orangeqt alone.
+== Linking to external libraries ==
+The Orange source includes some third party libraries that are statically linked
+ * LIBSVM (v3.2 - v3.* is required)
+To customize the build process to link to the corresponding external library instead, try.
+* For the setup.py method modify the setup-site.cfg file.
+* For make, pass the library names on the command line or through environment variables (listed
+in source/Makefile). Example: