Fixes for DWrite header checks
diff --git a/configure.ac b/configure.ac
index d763dc9..8873907 100644
--- a/configure.ac
+++ b/configure.ac
@@ -366,7 +366,7 @@
 have_directwrite=false
 AC_LANG_PUSH([C++])
 if test "x$with_directwrite" = "xyes" -o "x$with_directwrite" = "xauto"; then
-	AC_CHECK_HEADERS(dwrite.h, have_directwrite=true)
+	AC_CHECK_HEADERS(dwrite_1.h, have_directwrite=true)
 fi
 AC_LANG_POP([C++])
 if test "x$with_directwrite" = "xyes" -a "x$have_directwrite" != "xtrue"; then