Failed compile on Sun

Hi

I am fairly new to PostgreSQL. I have been trying to install
PostgreSQL-7.2.1 on my Sun server, however it fails at this point:

...
...

gcc -Wall -Wmissing-prototypes -Wmissing-declarations -fPIC -I.
-I../../../src/include -DFRONTEND -DSYSCONFDIR='"/usr/local/pgsql/etc"' -c
-o pqsignal.o pqsignal.c
ar crs libpq.a fe-auth.o fe-connect.o fe-exec.o fe-misc.o fe-print.o
fe-lobj.o pqexpbuffer.o dllist.o md5.o pqsignal.o
make[3]: ar: Command not found
make[3]: *** [libpq.a] Error 127
make[3]: Leaving directory
`/usr/local/install/postgresql-7.2/src/interfaces/libpq'
make[2]: *** [all] Error 2
make[2]: Leaving directory
`/usr/local/install/postgresql-7.2/src/interfaces'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/usr/local/install/postgresql-7.2/src'
make: *** [all] Error 2

System details:

bash-2.03$ uname -a
SunOS webdev1 5.8 Generic_108528-12 sun4u sparc SUNW,UltraAX-i2

Is this a common problem on this platform? Or am I doing something wrong.

Any help in getting this working would be greatly appreciated.

Thanks

Adam