Warnings while compilation

Hi, I've compiled XEmacs 21.0b59 one time with X-Support and one time without. Both times the compilation suceeded and XEmacs was working. But I found the following warnings. I don't know if they are interesting, but I think so and post them now. With X-Support the following warnings are presented: /home/shorty/work/xemacs-20/lib-src/etags.c: In function `hash': /home/shorty/work/xemacs-20/lib-src/etags.c:1849: warning: array subscript has type `char' /home/shorty/work/xemacs-20/lib-src/etags.c:1849: warning: array subscript has type `char' /home/shorty/work/xemacs-20/lib-src/ootags.c: In function `hash': /home/shorty/work/xemacs-20/lib-src/ootags.c:1912: warning: array subscript has type `char' /home/shorty/work/xemacs-20/lib-src/ootags.c:1912: warning: array subscript has type `char' search.c: In function `Fmatch_data': search.c:2265: warning: `prev' might be used uninitialized in this function search.c:2325: warning: `_obj' might be used uninitialized in this function redisplay-x.c: In function `x_flash': redisplay-x.c:2256: warning: implicit declaration of function `poll' Without X-Support the following warnings are presented: /home/shorty/work/xemacs-20/lib-src/etags.c: In function `hash': /home/shorty/work/xemacs-20/lib-src/etags.c:1849: warning: array subscript has type `char' /home/shorty/work/xemacs-20/lib-src/etags.c:1849: warning: array subscript has type `char' /home/shorty/work/xemacs-20/lib-src/ootags.c: In function `hash': /home/shorty/work/xemacs-20/lib-src/ootags.c:1912: warning: array subscript has type `char' /home/shorty/work/xemacs-20/lib-src/ootags.c:1912: warning: array subscript has type `char' events.c: In function `Fmake_event': events.c:637: warning: unused variable `f' search.c: In function `Fmatch_data': search.c:2265: warning: `prev' might be used uninitialized in this function search.c:2325: warning: `_obj' might be used uninitialized in this function Christian