diff --git a/build.tk b/build.tk
index 45ad48f7..f34c788e 100755
--- a/build.tk
+++ b/build.tk
@@ -53,7 +53,7 @@ proc SetConfigDefaults {} {
 #  Pops up an error dialog; then calls exit.
 #***********************************************************************
 proc Bail { msg } {
-    tk_dialog .err "Remind Configuration Error" $msg error 0 "Bummer"
+    tk_messageBox -message "Remind Build Error" -detail $msg -icon error -type ok
     exit 1
 }
 
diff --git a/docs/README.UNIX b/docs/README.UNIX
index b5cbadec..5482308b 100644
--- a/docs/README.UNIX
+++ b/docs/README.UNIX
@@ -95,7 +95,7 @@ Norman Walsh.
 #!/usr/local/bin/wish
 wm withdraw .
 after 15000 { destroy . ; exit }
-tk_dialog .d { Message } $argv warning 0 { OK }
+tk_messageBox -message Message -detail $argv -icon info -type ok
 destroy .
 exit
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