I have tracked down the problem to jquery.min.js from libjs-jquery, version 1.11.3+dfsg-3
That package contains this: $ ls -lah /usr/share/javascript/jquery total 580K drwxr-xr-x 2 root root 4.0K Sep 23 00:51 . drwxr-xr-x 4 root root 4.0K Sep 23 00:51 .. -rw-r--r-- 1 root root 278K Aug 29 03:46 jquery.js lrwxrwxrwx 1 root root 13 Aug 29 03:46 jquery.lite.js -> jquery.min.js -rw-r--r-- 1 root root 144K Aug 29 03:46 jquery.min.js -rw-r--r-- 1 root root 148K Aug 29 03:46 jquery.min.map lrwxrwxrwx 1 root root 13 Aug 29 03:46 jquery.pack.js -> jquery.min.js Where jquery.min.js is obtained by uglifying jquery.js. Extract from jquery-1.11.3+dfsg/debian/rules: dist/jquery.min.js dist/jquery.min.map: dist/jquery.js uglifyjs \ --source-map dist/jquery.min.map \ --source-map-url jquery.min.map \ --output dist/jquery.min.js \ $^ There are at least two problems there: - jquery.min.map should not be distributed in the first place - jquery.min.js contains this at the very end: [...] "jquery",[],function(){return jQuery})}var _jQuery=window.jQuery,_$=window.$;jQuery.noConflict=function(deep){if(window.$===jQuery){window.$=_$}if(deep&&window.jQuery===jQuery){window.jQuery=_jQuery}return jQuery};if(typeof noGlobal===st rundefined){window.jQuery=window.$=jQuery}return jQuery}); //# sourceMappingURL=jquery.min.map See that comment? Remember it When Wt builds, jquery.min.js, Wt.min.js and Boot.min.js are converted to C by the filetostring.cmake macro called in src/CMakeLists.txt. This generates JQuery_js.C, Boot_js.C and Wt_js.C. The extraneous comment in /usr/share/javascript/jquery/jquery.min.js results in this in JQuery_js.C: "jquery\",[],function(){return jQuery})}var _jQuery=window.jQuery,_$=window.$;jQuery.noConflict=function(deep){if(window.$===jQuery){window.$=_ $}if(deep&&window.jQuery===jQuery){window.jQuery=_jQuery}return jQuery};if(typeof noGlobal===strundefined){window.jQuery=window.$=jQuery}return jQuery});\r\n" "//# sourceMappingURL=jquery.min.map"; std::vector<const char *> JQuery_js() { std::vector<const char *> retval; retval.push_back(JQuery_js1); retval.push_back(JQuery_js2); retval.push_back(JQuery_js3); return retval; } } When Wt generates JavaScript and that comment gets in the middle, it causes errors. Therefore, I think the problem boils down to bad minification of jquery.js in the libjs-jquery package. I will report the bug -- Pau Garcia i Quiles http://www.elpauer.org (Due to my workload, I may need 10 days to answer)