I think gdk_display_open accepts NULL, to mean use the DISPLAY
environment variable (the same as XOpenDisplay), though the docs don't
seem to say so explicitly.
--- GdkDisplay.xs 30 Dec 2007 10:39:23 +1100 1.18
+++ GdkDisplay.xs 13 Apr 2008 16:27:02 +1000
@@ -32,7 +32,7 @@
## GdkDisplay *gdk_display_open (const gchar *display_name)
GdkDisplay_ornull *
-gdk_display_open (class, const gchar * display_name)
+gdk_display_open (class, const gchar_ornull * display_name)
C_ARGS:
display_name
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