[arch-general] PKGBUILD problem Can't exec "aclocal":

[richard terry]

I wonder if anyone can help me trace how to fix this error message:

Can't exec "aclocal": No such file or directory 
at /usr/share/autoconf/Autom4te/FileUtils.pm line 326.
autoreconf: failed to run aclocal: No such file or directory

which seems to be holding up one of my PKGBUILDs which does in fact compile on 
my laptop, but now won't on a new machine, so I'm obviously missing 
something.

Thanks.