Yatex does not work with Emacs26 because a built-in function string-to-int was removed. Please replace string-to-int by string-to-number. Work arround in my .emacs: (defalias 'string-to-int 'string-to-number) --- *Message* --- Loading /usr/local/share/emacs/site-lisp/yatex-startup.el (source)...done >=: Symbol’s function definition is void: string-to-int
Is this still the case with latest emacs?