I probably should wait for advice on how to build from SVN. I decided to try this with tqtinterface as that package only requires 1.5 minutes to compile. The first time I compile from within the SVN directory rather than copying the tqtinterface files to tmpfs, the compile works. Thereafter the compile always fails: ./tqinputcontext.h:32:27: error: qinputcontext.h: No such file or directory I tried adding 'make clean' at different places but that did not help. I'm sure I'm missing the big picture with something simple. Using ccache might be trying to work. The cache directory is populated and I see configure messages about using ccache. Yet I don't realize any benefits because the build keeps failing.