Index: src/OFStreamObserver_kqueue.m
==================================================================
--- src/OFStreamObserver_kqueue.m
+++ src/OFStreamObserver_kqueue.m
@@ -103,12 +103,12 @@
 	void *pool = objc_autoreleasePoolPush();
 	struct timespec timespec;
 	struct kevent eventList[EVENTLIST_SIZE];
 	int i, events, realEvents = 0;
 
-	timespec.tv_sec = timeout;
-	timespec.tv_nsec = (timeout - timespec.tv_sec) * 1000000000;
+	timespec.tv_sec = (time_t)timeout;
+	timespec.tv_nsec = (long)((timeout - timespec.tv_sec) * 1000000000);
 
 	[self OF_processQueue];
 
 	if ([self OF_processCache]) {
 		objc_autoreleasePoolPop(pool);

Index: src/OFStreamObserver_poll.m
==================================================================
--- src/OFStreamObserver_poll.m
+++ src/OFStreamObserver_poll.m
@@ -142,11 +142,11 @@
 	if (nFDs > OPEN_MAX)
 		@throw [OFOutOfRangeException exceptionWithClass: [self class]];
 #endif
 
 	if (poll(FDsCArray, (nfds_t)nFDs,
-	    (timeout != -1 ? timeout * 1000 : -1)) < 1)
+	    (int)(timeout != -1 ? timeout * 1000 : -1)) < 1)
 		return NO;
 
 	for (i = 0; i < nFDs; i++) {
 		pool = objc_autoreleasePoolPush();
 

Index: src/OFStreamObserver_select.m
==================================================================
--- src/OFStreamObserver_select.m
+++ src/OFStreamObserver_select.m
@@ -96,12 +96,18 @@
 	readFDs_ = readFDs;
 	writeFDs_ = writeFDs;
 	exceptFDs_ = exceptFDs;
 #endif
 
-	time.tv_sec = timeout;
-	time.tv_usec = (timeout - time.tv_sec) * 1000;
+	/*
+	 * We cast to int before assigning to tv_usec in order to avoid a
+	 * warning with Apple GCC on PPC. POSIX defines this as suseconds_t,
+	 * however, this is not available on Win32. As an int should always
+	 * satisfy the required range, we just cast to int.
+	 */
+	time.tv_sec = (time_t)timeout;
+	time.tv_usec = (int)((timeout - time.tv_sec) * 1000);
 
 	if (select((int)maxFD + 1, &readFDs_, &writeFDs_, &exceptFDs_,
 	    (timeout != -1 ? &time : NULL)) < 1)
 		return NO;