I believe I have solved the issue. the key for me was needing to pass the `--sysroot` flag to TARGET_*FLAGS variables since the sysroot flag being passed to CC/CPP/CXX variables were being replaced during compilation for some reason. Also including `--prefix=${RECIPE_SYSROOT}${prefix}` in the EXTRA_OECONF variable ensured the appropriate include/lib paths were accessible. I think this was a strange project because some of the other autoconf projects "just worked".