Configure script failed to find C compiler, despite gcc being installed on Sabayon

I have been trying to compile Moksha from source code on a Sabayon SpinBase Virtual Machine, but whenever I run a configure or autogen.sh script I get an error: checking for gcc... gcc checking whether the C compiler works... no I have installed [libc](https://packages.sabayon.org/show/libc,71536,sabayon-weekly,amd64,5,standard) too.