うほっ、コンパイルできません
以下のような感じでとまるんですがどういうことでしょうか。
1.5.4のコンパイルにチャレンジしてみたわけですが

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protos.h:442: warning: conflicting types for built-in function `fprintf'
protos.h:443: warning: conflicting types for built-in function `printf'
protos.h:447: conflicting types for `sscanf'
protos.h:447: a parameter list with an ellipsis can't match an empty parameter n
ame list declaration
/usr/include/stdio.h:181: previous declaration of `sscanf'
make[2]: *** [patchlist.o] Error 1
make[2]: Leaving directory `/home/myhomedir/tmp/mutt-1.5.4'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/myhomedir/tmp/mutt-1.5.4'
make: *** [all-recursive-am] Error 2