Re: 2.5.31: checking for GNU m4

[john43]

>Is the use of -P the only reason flex needs _GNU_ m4?
>If so, can't it simply include an m4 file that 
simulates this?
>For example, autoconf's m4sugar does this:
>
>## ------------------------------- ##
>## 1. Simulate --prefix-builtins.  ##
>## ------------------------------- ##
>
># m4_define
># m4_defn
># m4_undefine
>define([m4_define],   defn([define]))
>define([m4_defn],     defn([defn]))
>define([m4_undefine], defn([undefine]))
>
>m4_undefine([define])
>m4_undefine([defn])
>m4_undefine([undefine])

Thanks, we will try this.