include: Header files for d3dx9_xx.
diff --git a/include/Makefile.in b/include/Makefile.in
index e1d53da..c446810 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -112,6 +112,9 @@
 	d3dx8core.h \
 	d3dx8math.h \
 	d3dx8math.inl \
+	d3dx9.h \
+	d3dx9math.h \
+	d3dx9math.inl \
 	dbghelp.h \
 	dbinit.idl \
 	dbprop.idl \