why not check $PATH for m4?

[Chris Pickett]

Hi,

I'm not subscribed, please reply-all.

I installed m4-1.4.8 locally.  However, in order for auto(re)conf find 
it, I have to do `export M4=$HOME/$MY_PREFIX/bin/m4'

Otherwise, with an empty $M4, I get this error from /usr/bin/m4:

/usr/bin/m4: `changeword' from frozen file not found in builtin table!

Is this the right behaviour for some reason I don't know?  Can the $PATH 
be checked for m4 first?  I have autoconf, automake, libtool installed 
locally as well, and $HOME/$MY_PREFIX/bin is on my path.

I can file a bug report if you'd like that.

Chris