Comma in the output of esyscmd

Hi.

I have a problem with a comma in the output of an esyscmd expansion - I 
can't make M4 not to interpret it as an argument list separator. Here is 
an example:


$ pwd
/home/gbr/ala, bala
$ m4
include(/usr/share/doc/m4/examples/quote.m4)

dquote(esyscmd(pwd))
`/home/gbr/ala',`bala
'


What I'd like is the result to be:
`/home/gbr/ala, bala
'

Thank you for your help in advance.

Vlado