Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -469,11 +469,11 @@
 AC_CHECK_HEADER(poll.h, [
 	AC_DEFINE(HAVE_POLL_H, 1, [Whether we have poll.h])
 	AC_SUBST(OFSTREAMPOLLOBSERVER_M, "OFStreamPollObserver.m")
 ])
 AC_CHECK_HEADERS(sys/select.h, [
-	AC_DEFINE(HAVE_SYS_SELECT_H, 1, [Whether we have sys/select.h])
+	AC_DEFINE(OF_HAVE_SYS_SELECT_H, 1, [Whether we have sys/select.h])
 	AC_SUBST(OFSTREAMSELECTOBSERVER_M, "OFStreamSelectObserver.m")
 ])
 
 AC_MSG_CHECKING(for getaddrinfo)
 AC_TRY_COMPILE([

Index: src/objfw-defs.h.in
==================================================================
--- src/objfw-defs.h.in
+++ src/objfw-defs.h.in
@@ -8,11 +8,10 @@
 #undef OF_HAVE_FAST_ENUMERATION
 #undef OF_HAVE_GCC_ATOMIC_OPS
 #undef OF_HAVE_OPTIONAL_PROTOCOLS
 #undef OF_HAVE_OSATOMIC
 #undef OF_HAVE_OSATOMIC_64
-#undef OF_HAVE_POLL
 #undef OF_HAVE_PROPERTIES
 #undef OF_HAVE_PTHREADS
 #undef OF_HAVE_PTHREAD_SPINLOCKS
 #undef OF_HAVE_SCHED_YIELD
 #undef OF_HAVE_SYS_SELECT_H