>   Solaris's /bin/sh is broken in some fantastic and amazing ways.

Not really!  it is a 'proper' bourne shell :-)
In some senses the scripts are at fault for assuming non-bourne
shell behaviour :-(

build.sh falls over because different shells treat the following
slightly differently:

$ xy=:x:y
$ IFS=:
$ set $xy
$ echo $1

(traditional sh sets $1=x, ksh et al set $2=x)

	David

-- 
David Laight: david@l8s.co.uk