- (setq-local mwheel-scroll-up-function #'doc-view-scroll-up-or-next-page)
- (setq-local mwheel-scroll-down-function
- #'doc-view-scroll-down-or-previous-page)
+ (if (boundp 'mwheel-scroll-up-function) ; not --without-x build
+ (setq-local mwheel-scroll-up-function
+ #'doc-view-scroll-up-or-next-page))
+ (if (boundp 'mwheel-scroll-down-function)
+ (setq-local mwheel-scroll-down-function
+ #'doc-view-scroll-down-or-previous-page))