Working with #83:
I'm not sure if my Makefile / configure script is incorrectly written and does not properly handle the build dependencies, but given the fact that pie always runs both phpize and ./configure for each build, it would probably make sense to run the equivalent of git clean -fdx in the build directory to ensure that the build is internally consistent. Even if the build infrastructure is actually faulty, this could otherwise lead to hard-to-debug issues.