The APR configure phase does not handle correctly the universal compilation feature present on Mac OS X 10.5 (Leopard) which allow for simultaneous build of 32 and 64bit binaries on both Intel and PPC environement. Specificaly in include/apr.h: 1. Typedefs of apr_[u]int*_t should be set to the respective [u]int*_t (from <sys/types.h>) and not be standard C types; 2. The APR_SIZEOF_VOIDP is set to 4, irrespectively of the arch. This should be replaced by something like (for gcc): #if defined(__LP32__) #define APR_SIZEOF_VOIDP 4 #elif defined (__LP64__) #define APR_SIZEOF_VOIDP 8 #endif Patching the include/apr.h with these two changes allows the build to finish correctly, but it would be nice to get rid of them, if possible. Thanks!