How to compile correctly with gcc?

Dear Postgre SQL group:
Wonder if you can give me some hint with PostgreSQL 6.4 installation.
I never install a database before. I downloaded 6.4 and followed the
instructions to install then:
1)it created "postgresql-v6.4 directory
2)"src" is under this directory
3)I moved them up to stay under /usr/src/pgsql
4)it couldn't recognize C compiler
Here's the message from the installation. Could anyone help?
Thanks.

Eddie

Platform: Sun Enterprise-450 with Solaris 2.5.1
Others on the system-
Apache 1.2.5, Oracle 7.3.3, AutoXfer 2.7.5

# pwd
/usr/src/pgsql/src

# ls -l configure
-rwxr-xr-x   1 postgres postgres  186752 Nov 18 17:33 configure

# ./configure
loading cache ./config.cache
checking host system type... sparc-sun-solaris2.5.1
checking echo setting...
checking setting template to... solaris_sparc_gcc
checking setting USE_LOCALE... disabled
checking setting CYR_RECODE... disabled
checking setting MULTIBYTE... disabled
checking setting DEF_PGPORT... 5432
checking setting USE_TCL... disabled
checking setting USE_PERL... disabled
checking setting USE_ODBC... disabled
checking setting ASSERT CHECKING... disabled
checking for gcc... gcc
checking whether the C compiler (gcc  ) works... no
configure: error: installation or configuration problem: C compiler
cannot crea.

tnesdp1# ./configure --with-template=solaris_sparc_gcc
loading cache ./config.cache
checking host system type... sparc-sun-solaris2.5.1
checking echo setting...
checking setting template to... solaris_sparc_gcc
checking setting USE_LOCALE... disabled
checking setting CYR_RECODE... disabled
checking setting MULTIBYTE... disabled
checking setting DEF_PGPORT... 5432
checking setting USE_TCL... disabled
checking setting USE_PERL... disabled
checking setting USE_ODBC... disabled
checking setting ASSERT CHECKING... disabled
checking for gcc... gcc
checking whether the C compiler (gcc  ) works... no
configure: error: installation or configuration problem: C compiler
cannot crea.

#-rw-rw-rw-   1 root      182128 Nov  6 11:15 /usr/local/bin/gcc

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