move to xelatex
diff --git a/.gitignore b/.gitignore
index ec572cd..8c79b74 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,6 +42,7 @@
 doc/docsrc/*.log
 doc/docsrc/*.out
 doc/docsrc/*.toc
+doc/docsrc/*.xdv
 
 # /examples/
 /examples/Makefile