make install in a chroot?

[Jason Price <jprice@xxxxxxxxxxxxxxxxxxxx>]

I'm trying to build a solaris package for zsh.  The easiest way to do this
is to make a chroot, do the make install into the chroot's /usr/local/, and
then work from there.

The make install step seems to require gcc be accessable.  It does (at
least) the following:

nawk -f ./signames1.awk /usr/include/sys/iso/signal_iso.h >sigtmp.c
gcc -E sigtmp.c >sigtmp.out

I've tried to short circuit the process, and make that file while not
within the chroot, however this didn't work.

First question: why on earth isn't this built in the main 'make' step, or
if it is, why is it rebuilt in the make install step?

Second question: is there an easier way?  (aka am I being stupid?)

Thanks;
Jason