FreeRADIUS 2.1.8 fails to build when configured --without-pthreads

FreeRADIUS 2.1.8 HP NonStop OSS src/main/event.c compile fails when configured --without-pthreads, because WITH_PROXY is still defined in radius.h I defined WITHOUT_PROXY and WITHOUT_COA and am still getting a lot of errors. Any advice? Also, how should WITHOUT_PROXY/WITHOUT_COA/whatever be specified during configure -- by using CPPFLAGS? And how should I report nitpicky gcc-isms?