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#include <gdk/gdk.h>/*gdk_pixmap_new (drawable, width, height, depth) : g_return_val_if_fail (drawable == NULL || GDK_IS_DRAWABLE (drawable), NULL); g_return_val_if_fail ((drawable != NULL) || (depth != -1), NULL); g_return_val_if_fail ((width != 0) && (height != 0), NULL);stderr :(process:25289): Gdk-CRITICAL **: gdk_pixmap_new: assertion `(drawable != NULL) || (depth != -1)' failed*/int main() {        GdkPixmap*  pixmap;        pixmap = gdk_pixmap_new (NULL, 0, 0, -1);        printf("%x\n", pixmap);        return 0;}