Just in case you do have a real compiler under /opt/SUNWspro/bin/cc, you might try adding /opt/SUNWspro/bin/ to your search path (at the beginning, i.e. export PATH=/opt/SUNWspro/bin:$PATH) before you start the build.
As root or normal user? I have this for both cases

root (before exporting as you suggested): 
sadm@bioinfo-z:~$ su -
Password:
root@bioinfo-z:~# printenv
SHELL=/bin/bash
TERM=vt100
USER=root
PATH=/usr/local/bin:/usr/ucb:/bin:/usr/bin:/etc:/usr/sfw/bin:/opt/sfw/
+bin:/opt/SUNWspro/bin:/usr/ccs/bin:/opt/sfw/bin:/opt/SUNWicg/SunScree
+n/bin
PWD=/home/root
SHLVL=1
HOME=/home/root
LOGNAME=root
_=/usr/local/bin/printenv

[download]
normal user: 
sadm@bioinfo-z:~$ printenv
LC_MONETARY=en_US.ISO8859-1
TERM=vt100
SHELL=/bin/bash
SSH_CLIENT=172.18.177.29 1681 22
PERL5LIB=/home/sadm/lib/site_perl/sun4-solaris-64int:/home/sadm/lib/si
+te_perl/
LC_NUMERIC=en_US.ISO8859-1
SSH_TTY=/dev/pts/21
USER=sadm
MAIL=/var/mail//sadm
PATH=/home/sadm/.perl/bin:/home/sadm/bin:/usr/local/bin:/usr/bin:/usr/
+sfw/bin:/opt/sfw/bin:/opt/SUNWspro/bin:/usr/ccs/bin
LC_MESSAGES=C
LC_COLLATE=en_US.ISO8859-1
PWD=/home/sadm
EDITOR=vim
TZ=Singapore
SHLVL=1
HOME=/home/sadm
LOGNAME=sadm
SSH_CONNECTION=172.18.177.29 1681 192.168.24.136 22
LC_CTYPE=en_US.ISO8859-1
_=/usr/local/bin/printenv

[download]
And also I have: 
sadm@bioinfo-z:~$ perl -ve
This is perl, v5.8.7 built for sun4-solaris-thread-multi

sadm@bioinfo-z:~$ which perl
/home/sadm/.perl/bin/perl

[download]
and as root I have: 
root@bioinfo-z:~# perl -ve
This is perl, v5.8.4 built for sun4-solaris-64int
(with 28 registered patches, see perl -V for more detail)

root@bioinfo-z:~# which perl
/bin/perl

[download]
and after exporting export PATH=/opt/SUNWspro/bin:$PATH as root. Doing make give me exactly the same error message as my OP.

---
neversaint and everlastingly indebted.......

In reply to Re^4: Problem installing GD.pm under Solaris by neversaint
in thread Problem installing GD.pm under Solaris by neversaint

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