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--- xscreensaver-5.12/driver/passwd.c.debug2	2008-12-27 19:17:26.000000000 +0900
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+++ xscreensaver-5.12/driver/passwd.c	2011-04-03 21:55:26.000000000 +0900
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@@ -205,7 +205,7 @@
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 {
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 # ifdef HAVE_SYSLOG
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   struct passwd *pw = getpwuid (getuid ());
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-  char *d = DisplayString (si->dpy);
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+  char *d = (si->dpy ? DisplayString (si->dpy) : 0);
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   char *u = (pw && pw->pw_name ? pw->pw_name : "???");
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   int opt = 0;
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   int fac = 0;