Vanilla Solaris does not come with a compiler. The Software Companion CD/DVD does have gcc on it but that is not guarenteed to be installed and even if it is the PATH likely needs to be updated. For example:

export PATH="/usr/sfw/bin:/opt/sfw/bin/:$PATH"
export LD_LIBRARY_PATH="/usr/sfw/lib:/opt/sfw/lib/:$LD_LIBRARY_PATH"
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