Although I have ccache installed and configured -- and used by (most of) the ports, openjdk8's configure advises me of the following: Build performance summary: * Cores to use: 4 * Memory limit: 15776 MB * ccache status: not installed (consider installing) Build performance tip: ccache gives a tremendous speedup for C++ recompilations. You do not have ccache installed. Try installing it. Whatever it is, it is probably worth fixing...