Hi i know this problem is on solaris but i went to same problem on debian, so maybe my solution will help anybody: what i did was trying to install Digest::SHA1 cpan command line by : install Digest::SHA1 i got same error as author of this question -> missing cc

so on debian i did :

apt-get install gcc

in CPAN command line problem still appear :

cpan> install Digest::SHA1

Running install for module 'Digest::SHA1'

GAAS/Digest-SHA1-2.13.tar.gz

Has already been unwrapped into directory /root/.cpan/build/Digest-SHA1-2.13-rlp1Ni

GAAS/Digest-SHA1-2.13.tar.gz

Has already been prepared

GAAS/Digest-SHA1-2.13.tar.gz

Could not make: Unknown error

BUT in bash :

cpan Digest::SHA1

installation succeeded.