minisip trunk build error

[Juha Heinanen]

zach,

would it be possible to check using configure or some other means that
libtool is new enough and stop with error message if it is too old?

i agree with you that it does not make sense to support buggy versions
of other people's software, but it would save a lot of people's time if
build process would know which versions of other software is needed for
proper build of minisip.

-- juha