Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -184,11 +184,11 @@
 
 AC_MSG_CHECKING(whether we need -D_GNU_SOURCE)
 AC_EGREP_CPP(yes, [
 	#include <stdlib.h>
 
-	#ifdef __GLIBC__
+	#if defined(__GLIBC__) || defined(__MINGW32__)
 	yes
 	#endif
 ], [
 	CPPFLAGS="-D_GNU_SOURCE $CPPFLAGS"
 	AC_MSG_RESULT(yes)

Index: src/OFSettings_INIFile.m
==================================================================
--- src/OFSettings_INIFile.m
+++ src/OFSettings_INIFile.m
@@ -16,10 +16,11 @@
 
 #include "config.h"
 
 #import "OFSettings_INIFile.h"
 #import "OFString.h"
+#import "OFArray.h"
 #import "OFINIFile.h"
 #import "OFSystemInfo.h"
 
 @implementation OFSettings_INIFile
 - initWithApplicationName: (OFString*)applicationName

Index: src/OFStream.h
==================================================================
--- src/OFStream.h
+++ src/OFStream.h
@@ -89,11 +89,13 @@
 #ifndef OF_SEEKABLE_STREAM_M
 @private
 #endif
 	char *_readBuffer, *_writeBuffer;
 	size_t _readBufferLength, _writeBufferLength;
-	bool _writeBufferEnabled, _blocking, _waitingForDelimiter;
+	bool _writeBufferEnabled, _waitingForDelimiter;
+@protected
+	bool _blocking;
 }
 
 #ifdef OF_HAVE_PROPERTIES
 @property (getter=isWriteBufferEnabled) bool writeBufferEnabled;
 @property (getter=isBlocking) bool blocking;

Index: utils/OFZIP.m
==================================================================
--- utils/OFZIP.m
+++ utils/OFZIP.m
@@ -33,10 +33,17 @@
 
 #import "autorelease.h"
 #import "macros.h"
 
 #define BUFFER_SIZE 4096
+
+#ifndef S_IRWXG
+# define S_IRWXG 0
+#endif
+#ifndef S_IRWXO
+# define S_IRWXO 0
+#endif
 
 @interface OFZIP: OFObject
 {
 	int_fast8_t _override, _outputLevel;
 	int _exitStatus;