Use t for non-nil default values in boolean defcustom declarations

* lisp/emulation/viper-ex.el (ex-unix-type-shell):
* lisp/emulation/viper-init.el (viper-ms-style-os-p):
* lisp/eshell/em-glob.el (eshell-glob-case-insensitive):
* lisp/filecache.el (file-cache-ignore-case):
* lisp/lpr.el (lpr-add-switches):
* lisp/ls-lisp.el (ls-lisp-ignore-case):
* lisp/mail/binhex.el (binhex-use-external):
* lisp/progmodes/cperl-mode.el (cperl-electric-parens-mark):
Normalise default values to nil or t.

1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el
index b6f0e9bca41..ed021a7ebc9 100644
--- a/lisp/progmodes/cperl-mode.el
+++ b/lisp/progmodes/cperl-mode.el
@@ -275,7 +275,7 @@ Can be overwritten by `cperl-hairy' if nil."
   :type '(choice (const null) boolean)
   :group 'cperl-affected-by-hairy)
 
-(defcustom cperl-electric-parens-mark window-system
+(defcustom cperl-electric-parens-mark (not (not window-system))
   "Not-nil means that electric parens look for active mark.
 Default is yes if there is visual feedback on mark."
   :type 'boolean