Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -20,10 +20,22 @@
 AX_CHECK_COMPILER_FLAGS(-fno-common, [OBJCFLAGS="$OBJCFLAGS -fno-common"])
 AX_CHECK_COMPILER_FLAGS(-fno-constant-cfstrings, [
 	NO_CONST_CFSTRINGS="-fno-constant-cfstrings"
 	OBJCFLAGS="$OBJCFLAGS -fno-constant-cfstrings"])
 AC_SUBST(NO_CONST_CFSTRINGS)
+
+AC_MSG_CHECKING(whether Objective C compiler supports fast enumeration)
+AC_TRY_COMPILE([
+	#import <objc/objc.h>
+	], [
+	id n = nil;
+	for (id i in n);
+	], [
+	AC_DEFINE(OF_HAVE_FAST_ENUMERATION, 1, [Fast Enumeration support])
+	AC_MSG_RESULT(yes)
+	], [
+	AC_MSG_RESULT(no)])
 
 AC_MSG_CHECKING(which Objective C runtime we use)
 dnl TODO: This is ugly. Let's think of a better check.
 AC_EGREP_CPP(gnu, [
 	#import <objc/objc.h>
@@ -143,11 +155,12 @@
 	#include <sys/socket.h>
 	#include <netdb.h>
 	#else
 	#define _WIN32_WINNT 0x0501
 	#include <ws2tcpip.h>
-	#endif], [
+	#endif
+	], [
 	struct addrinfo ai;
 	getaddrinfo(NULL, NULL, NULL, NULL);
 	], [
 	AC_MSG_RESULT(yes)
 	AC_DEFINE(HAVE_GETADDRINFO, 1, [Whether we have getaddrinfo])

Index: tests/OFArray.m
==================================================================
--- tests/OFArray.m
+++ tests/OFArray.m
@@ -63,10 +63,23 @@
 
 	TEST(@"-[indexOfObject:]", [a[0] indexOfObject: c_ary[1]] == 1)
 
 	TEST(@"-[indexOfObjectIdenticalTo:]",
 	    [a[0] indexOfObjectIdenticalTo: c_ary[1]] == 1)
+
+#ifdef OF_HAVE_FAST_ENUMERATION
+	size_t i = 0;
+	BOOL ok = YES;
+
+	for (OFString *s in a[0]) {
+		if (![s isEqual: c_ary[i]])
+			ok = NO;
+		i++;
+	}
+
+	TEST(@"Fast Enumeration", ok)
+#endif
 
 	TEST(@"-[replaceObject:withObject:]",
 	    [a[0] replaceObject: c_ary[1]
 		     withObject: c_ary[0]] &&
 	    [[a[0] objectAtIndex: 0] isEqual: c_ary[0]] &&