Docs: GH39, Update BUILD.md for directions on installing python lxml module

diff --git a/BUILD.md b/BUILD.md
index 80e1706..91a83de 100644 (file)
--- a/BUILD.md
+++ b/BUILD.md
@@ -76,7 +76,17 @@ Windows 7+ with additional required software packages:
   - Tell the installer to "Add CMake to the system PATH" environment variable.
 - Python 3 (from https://www.python.org/downloads).  Notes:
   - Select to install the optional sub-package to add Python to the system PATH environment variable.
+  - Ensure the pip module is installed (it should be by default)
   - Need python3.3 or later to get the Windows py.exe launcher that is used to get python3 rather than python2 if both are installed on Windows
+  - 32 bit python works
+- Python lxml package must be installed
+  - Download the lxml package from
+        http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
+        32-bit latest for Python 3.5 is: lxml-3.5.0-cp35-none-win32.whl
+        64-bit latest for Python 3.5 is: lxml-3.5.0-cp35-none-win_amd64.whl
+  - The package can be installed with pip as follows:
+        pip install lxml-3.5.0-cp35-none-win32.whl
+        If pip is not in your path, you can find it at $PYTHON_HOME\Scripts\pip.exe, where PYTHON_HOME is the folder where you installed Python.
 - Git (from http://git-scm.com/download/win).
   - Note: If you use Cygwin, you can normally use Cygwin's "git.exe".  However, in order to use the "update_external_sources.bat" script, you must have this version.
   - Tell the installer to allow it to be used for "Developer Prompt" as well as "Git Bash".