generated Makefile has wrong value set for INSTALL

I have incorporated the expat build process into our combined software
builds and it has been working fine.

However recently a user other than myself carried out the same process

( cd expat; configure --prefix=/workingdirectory/expat;
PATH=/usr/ccs/bin:$(PATH); /usr/local/bin/make all; /usr/local/bin/make
install; cd .. )

The symptoms I think I have traced to, following the configure, the wrong
value set in the generated Makefile for INSTALL.  When I build I get it set
to 'conftools/install-sh -c', but he gets it set to something quite
different that looks like some local feature.

I have been looking at the configure script to try to see what is used in
this aprt of the Makefile generatio / fillin the blanks bit, but so far I
have not managed to figure it out.

I would be very grateful if some-one could put me straight.

Many thanks,

Andrew Hardy.