Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -7,19 +7,43 @@
 AC_PROG_CC
 AC_PROG_OBJC
 AC_PROG_CPP
 AC_PROG_LN_S
 AC_PATH_PROG(AR, ar)
+AC_PROG_EGREP
 
 CFLAGS="$CFLAGS -Wall"
 OBJCFLAGS="$OBJCFLAGS -Wall -fobjc-exceptions"
 
-BUILDSYS_SHARED_LIB
-
 AC_DEFINE(OF_CONFIG_H, 1, [Define so that we know we got our config.h])
+
+BUILDSYS_SHARED_LIB
 AC_C_BIGENDIAN([AC_DEFINE(OF_BIG_ENDIAN, 1, [Whether we are big endian])])
 
+AC_MSG_CHECKING(for SIZE_MAX)
+AC_EGREP_CPP(yes, [
+	#include <stdint.h>
+	#include <limits.h>
+
+	#ifdef SIZE_MAX
+	yes
+	#endif], AC_MSG_RESULT(yes), [
+	AC_MSG_RESULT(no)
+	AC_MSG_CHECKING(for SIZE_T_MAX)
+	AC_EGREP_CPP(yes, [
+		#include <stdint.h>
+		#include <limits.h>
+
+		#ifdef SIZE_T_MAX
+		yes
+		#endif], [
+		AC_MSG_RESULT(yes)
+		size_max="SIZE_T_MAX"], [
+		AC_MSG_RESULT(no)
+		size_max="((size_t)-1)"])
+	AC_DEFINE_UNQUOTED(SIZE_MAX, $size_max, [Maximum value for size_t])])
+
 AC_CHECK_FUNC(asprintf, [
 	have_asprintf="yes"
 	AC_DEFINE(HAVE_ASPRINTF, 1, "Whether we have asprintf")], [
 	have_asprintf="no"
 	AC_SUBST(ASPRINTF, "asprintf.c")])

Index: src/OFArray.m
==================================================================
--- src/OFArray.m
+++ src/OFArray.m
@@ -12,10 +12,11 @@
 #import "config.h"
 
 #import <stdio.h>
 #import <string.h>
 #import <unistd.h>
+#import <limits.h>
 
 #import "OFArray.h"
 #import "OFExceptions.h"
 #import "OFMacros.h"
 

Index: src/OFObject.m
==================================================================
--- src/OFObject.m
+++ src/OFObject.m
@@ -11,10 +11,11 @@
 
 #import "config.h"
 
 #import <stdlib.h>
 #import <string.h>
+#import <limits.h>
 
 #import "OFObject.h"
 #import "OFExceptions.h"
 #import "OFMacros.h"
 

Index: src/OFXMLFactory.m
==================================================================
--- src/OFXMLFactory.m
+++ src/OFXMLFactory.m
@@ -12,10 +12,11 @@
 #import "config.h"
 
 #import <stdarg.h>
 #import <stdlib.h>
 #import <string.h>
+#import <limits.h>
 
 #import "OFXMLFactory.h"
 #import "OFExceptions.h"
 #import "OFMacros.h"
 

Index: tests/OFArray/OFArray.m
==================================================================
--- tests/OFArray/OFArray.m
+++ tests/OFArray/OFArray.m
@@ -12,10 +12,11 @@
 #import "config.h"
 
 #import <stdio.h>
 #import <stdlib.h>
 #import <string.h>
+#import <limits.h>
 
 #import "OFArray.h"
 #import "OFExceptions.h"
 
 #define CATCH_EXCEPTION(code, exception)		\

Index: tests/OFObject/OFObject.m
==================================================================
--- tests/OFObject/OFObject.m
+++ tests/OFObject/OFObject.m
@@ -11,10 +11,11 @@
 
 #import "config.h"
 
 #import <stdio.h>
 #import <stdlib.h>
+#import <limits.h>
 
 #import "OFObject.h"
 #import "OFExceptions.h"
 
 #define CATCH_EXCEPTION(code, exception)		\