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diff -up bash-4.2/builtins/evalfile.c.old bash-4.2/builtins/evalfile.c
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--- bash-4.2/builtins/evalfile.c.old	2015-05-14 20:45:31.402793505 +0200
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+++ bash-4.2/builtins/evalfile.c	2015-05-14 20:45:47.632794791 +0200
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@@ -317,6 +317,23 @@ maybe_execute_file (fname, force_noninte
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   return result;
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 }
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+int
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+force_execute_file (fname, force_noninteractive)
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+     const char *fname;
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+     int force_noninteractive;
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+{
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+  char *filename;
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+  int result, flags;
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+
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+  filename = bash_tilde_expand (fname, 0);
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+  flags = 0;
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+  if (force_noninteractive)
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+    flags |= FEVAL_NONINT;
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+  result = _evalfile (filename, flags);
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+  free (filename);
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+  return result;
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+}
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+
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 #if defined (HISTORY)
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 int
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 fc_execute_file (filename)
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diff -up bash-4.2/configure.in.old bash-4.2/configure.in
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--- bash-4.2/configure.in.old	2015-05-14 21:27:20.882449456 +0200
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+++ bash-4.2/configure.in	2015-05-14 21:19:25.654612738 +0200
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@@ -149,7 +149,7 @@ fi
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 fi
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 if test -z "${DEBUGGER_START_FILE}"; then
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-	DEBUGGER_START_FILE='${datadir}/bashdb/bashdb-main.inc'
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+	DEBUGGER_START_FILE='/usr/share/bashdb/bashdb-main.inc'
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 fi
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 dnl optional shell features in config.h.in
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diff -up bash-4.2/shell.c.old bash-4.2/shell.c
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--- bash-4.2/shell.c.old	2015-05-14 20:42:54.379781066 +0200
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+++ bash-4.2/shell.c	2015-05-14 20:43:04.966781904 +0200
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@@ -1373,12 +1373,19 @@ start_debugger ()
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 {
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 #if defined (DEBUGGER) && defined (DEBUGGER_START_FILE)
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   int old_errexit;
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+  int r;
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   old_errexit = exit_immediately_on_error;
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   exit_immediately_on_error = 0;
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-  maybe_execute_file (DEBUGGER_START_FILE, 1);
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-  function_trace_mode = 1;
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+  r = force_execute_file (DEBUGGER_START_FILE, 1);
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+  if (r < 0)
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+    {
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+      internal_warning ("cannot start debugger; debugging mode disabled");
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+      debugging_mode = function_trace_mode = 0;
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+    }
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+  else
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+    function_trace_mode = 1;
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   exit_immediately_on_error += old_errexit;
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 #endif
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diff -up bash-4.2/builtins/evalfile.c.old bash-4.2/builtins/evalfile.c
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--- bash-4.2/builtins/evalfile.c.old	2015-05-15 00:52:01.357266353 +0200
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+++ bash-4.2/builtins/evalfile.c	2015-05-15 00:52:08.734263236 +0200
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@@ -125,7 +125,7 @@ file_error_and_exit:
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 	}
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       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE
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-      				      : ((errno == ENOENT) ? 0 : -1));
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+      				      : ((errno == ENOENT && (flags & FEVAL_ENOENTOK) != 0) ? 0 : -1));
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     }
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   errfunc = ((flags & FEVAL_BUILTIN) ? builtin_error : internal_error);
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diff -up bash-4.2/builtins/common.h.old bash-4.2/builtins/common.h
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--- bash-4.2/builtins/common.h.old	2015-05-15 00:52:01.357266353 +0200
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+++ bash-4.2/builtins/common.h	2015-05-15 00:52:08.734263236 +0200
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@@ -170,6 +170,7 @@
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 /* Functions from evalfile.c */
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 extern int maybe_execute_file __P((const char *, int));
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+extern int force_execute_file __P((const char *, int));
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 extern int source_file __P((const char *, int));
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 extern int fc_execute_file __P((const char *));
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