ccache: FATAL: Could not find compiler "gcc" in PATH

Hello,
I am trying to build a package for MacPorts (https://code.launchpad.net/~rudloff/+junk/macports-package).
If I launch debuild, the package builds just fine. But when I use pbuilder, the configure script fails with this error:
configure:3036: checking for gcc
configure:3052: found /usr/lib/ccache/gcc
configure:3063: result: gcc
configure:3292: checking for C compiler version
configure:3301: gcc --version >&5
ccache: FATAL: Could not find compiler "gcc" in PATH

I have absolutely no idea of what causes this.