4 files changed, 6 insertions, 5 deletions
diff --git a/progs/xdemos/glthreads.c b/progs/xdemos/glthreads.c
index b90e6b4f319..ea5474870bd 100644
--- a/progs/xdemos/glthreads.c
+++ b/progs/xdemos/glthreads.c
@@ -26,7 +26,7 @@
  *  -p                       Open a display connection for each thread
  *  -l                       Enable application-side locking
  *  -n <num threads>         Number of threads to create (default is 2)
- *  -display <display name>  Specify X display (default is :0.0)
+ *  -display <display name>  Specify X display (default is $DISPLAY)
  *  -t                       Use texture mapping
  *
  * Brian Paul  20 July 2000
@@ -573,7 +573,7 @@ usage(void)
 int
 main(int argc, char *argv[])
 {
-   char *displayName = ":0.0";
+   char *displayName = NULL;
    int numThreads = 2;
    Display *dpy = NULL;
    int i;
diff --git a/progs/xdemos/glxheads.c b/progs/xdemos/glxheads.c
index b3290e90d51..b1a63d3d50c 100644
--- a/progs/xdemos/glxheads.c
+++ b/progs/xdemos/glxheads.c
@@ -267,7 +267,8 @@ main(int argc, char *argv[])
       printf("  glxheads xdisplayname ...\n");
       printf("Example:\n");
       printf("  glxheads :0 mars:0 venus:1\n");
-      h = AddHead(":0");
+
+      h = AddHead(XDisplayName(NULL));
       if (h)
          PrintInfo(h);
    }
diff --git a/progs/xdemos/glxswapcontrol.c b/progs/xdemos/glxswapcontrol.c
index 2c518019896..5a5d084f909 100644
--- a/progs/xdemos/glxswapcontrol.c
+++ b/progs/xdemos/glxswapcontrol.c
@@ -759,7 +759,7 @@ main(int argc, char *argv[])
    Display *dpy;
    Window win;
    GLXContext ctx;
-   char *dpyName = ":0";
+   char *dpyName = NULL;
    int swap_interval = 1;
    GLboolean do_swap_interval = GL_FALSE;
    GLboolean force_get_rate = GL_FALSE;
diff --git a/progs/xdemos/opencloseopen.c b/progs/xdemos/opencloseopen.c
index 0b8d0618431..756096095ef 100644
--- a/progs/xdemos/opencloseopen.c
+++ b/progs/xdemos/opencloseopen.c
@@ -158,7 +158,7 @@ main(int argc, char *argv[])
    Display *dpy;
    Window win;
    GLXContext ctx;
-   char *dpyName = ":0";
+   char *dpyName = NULL;
    int i;
 
    for (i = 1; i < argc; i++) {