acinclude.m4 leaves unexpanded macro

[Jason Stover]

Ben, your commit of acinclude.m4 left AS_ECHO unexpanded in configure
on my machine:

checking whether GSL needs -fgnu89-inline to link... ./configure: line 26587: 
syntax error near unexpected token `"$as_me: failed source file 1 of 2 was:"'
./configure: line 26587: `  AS_ECHO("$as_me: failed source file 1 of 2 was:") 
>&5'

The section of acinclude.m4 seems to be here:

+sed 's/^/| /' conftest1.$ac_ext >&AS_MESSAGE_LOG_FD
+AS_ECHO(["$as_me: failed source file 2 of 2 was:"]) >&AS_MESSAGE_LOG_FD
+sed 's/^/| /' conftest2.$ac_ext >&AS_MESSAGE_LOG_FD


$ aclocal --print-ac-dir
/usr/share/aclocal

$ grep AS_ECHO /usr/share/aclocal/*
$

I don't have it in gl/ either.

Where is AS_ECHO supposed to be defined? 

-Jason