Use newer version of Pygments that handles "yield from".
diff --git a/Doc/Makefile b/Doc/Makefile
index cb56ea9..6a804d4 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -53,7 +53,7 @@
 	fi
 	@if [ ! -d tools/pygments ]; then \
 	  echo "Checking out Pygments..."; \
-	  svn checkout $(SVNROOT)/external/Pygments-1.3.1/pygments tools/pygments; \
+	  svn checkout $(SVNROOT)/external/Pygments-1.5dev-20120930/pygments tools/pygments; \
 	fi
 
 update: clean checkout
diff --git a/Doc/make.bat b/Doc/make.bat
index 4ea2d51..a2220c0 100644
--- a/Doc/make.bat
+++ b/Doc/make.bat
@@ -37,7 +37,7 @@
 svn co %SVNROOT%/external/Sphinx-1.0.7/sphinx tools/sphinx
 svn co %SVNROOT%/external/docutils-0.6/docutils tools/docutils
 svn co %SVNROOT%/external/Jinja-2.3.1/jinja2 tools/jinja2
-svn co %SVNROOT%/external/Pygments-1.3.1/pygments tools/pygments
+svn co %SVNROOT%/external/Pygments-1.5dev-20120930/pygments tools/pygments
 goto end
 
 :update