notes-mode/mkconfig: don't reference undefined envvar NOTES_BIN_DIR

diff --git a/packages/notes-mode/mkconfig b/packages/notes-mode/mkconfig
index 637ca56faeec64b4db534c31d678e001449e18b8..eeb8180267f63d2ac9cafadae03b45ac38369998 100755 (executable)
--- a/packages/notes-mode/mkconfig
+++ b/packages/notes-mode/mkconfig
@@ -32,10 +32,11 @@ my($home_dir) = ((getpwuid($<))[7]);
 
 my(%defaults) = (
     'dir'      => ['path', '~/NOTES'],
-    'bin_dir'  => ['path', "$ENV{'NOTES_BIN_DIR'}"],
     'int_form' => ['form', '%Y%m'],
     'file_form'        => ['form', '%y%m%d'],
     );
+$defaults{'bin_dir'} = ['path', "$ENV{'NOTES_BIN_DIR'}"]
+    if defined($ENV{'NOTES_BIN_DIR'});
 
 my($key, $value, %notes);
 while (($key, $value) = each %defaults) {