@@ -13,10 +13,13 @@
  * Public License, either version 2 or 3, which can be found in the file
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
 
+#ifndef OBJFW_OF_OBJECT_H
+#define OBJFW_OF_OBJECT_H
+
 #include "objfw-defs.h"
 
 #ifndef __STDC_LIMIT_MACROS
 # define __STDC_LIMIT_MACROS
 #endif
@@ -27,12 +30,12 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
 #include <limits.h>
 
-#import "macros.h"
-#import "block.h"
+#include "macros.h"
+#include "block.h"
 
 /*
  * Some versions of MinGW require <winsock2.h> to be included before
  * <windows.h>. Do this here to make sure this is always done in the correct
  * order, even if another header includes just <windows.h>.
@@ -275,10 +278,11 @@
 		return false;
 
 	return true;
 }
 
+#ifdef __OBJC__
 @class OFMethodSignature;
 @class OFString;
 @class OFThread;
 
 /*!
@@ -288,15 +292,15 @@
  */
 @protocol OFObject
 /*!
  * @brief The class of the object.
  */
-#ifndef __cplusplus
+# ifndef __cplusplus
 @property (readonly, nonatomic) Class class;
-#else
+# else
 @property (readonly, nonatomic, getter=class) Class class_;
-#endif
+# endif
 
 /*!
  * @brief The superclass of the object.
  */
 @property OF_NULLABLE_PROPERTY (readonly, nonatomic) Class superclass;
@@ -490,37 +494,39 @@
  *
  * @return Whether a weak reference to this object has been retained
  */
 - (bool)retainWeakReference;
 @end
+#endif
 
 /*!
  * @class OFObject OFObject.h ObjFW/OFObject.h
  *
  * @brief The root class for all other classes inside ObjFW.
  */
+#ifdef __OBJC__
 OF_ROOT_CLASS
 @interface OFObject <OFObject>
 {
 @private
-#ifndef __clang_analyzer__
+# ifndef __clang_analyzer__
 	Class _isa;
-#else
+# else
 	Class _isa __attribute__((__unused__));
-#endif
+# endif
 }
 
-#ifdef OF_HAVE_CLASS_PROPERTIES
-# ifndef __cplusplus
+# ifdef OF_HAVE_CLASS_PROPERTIES
+#  ifndef __cplusplus
 @property (class, readonly, nonatomic) Class class;
-# else
+#  else
 @property (class, readonly, nonatomic, getter=class) Class class_;
-# endif
+#  endif
 @property (class, readonly, nonatomic) OFString *className;
 @property (class, readonly, nullable, nonatomic) Class superclass;
 @property (class, readonly, nonatomic) OFString *description;
-#endif
+# endif
 
 /*!
  * @brief The name of the object's class.
  */
 @property (readonly, nonatomic) OFString *className;
@@ -935,11 +941,11 @@
 	     withObject: (nullable id)object2
 	     withObject: (nullable id)object3
 	     withObject: (nullable id)object4
 	     afterDelay: (of_time_interval_t)delay;
 
-#ifdef OF_HAVE_THREADS
+# ifdef OF_HAVE_THREADS
 /*!
  * @brief Performs the specified selector on the specified thread.
  *
  * @param selector The selector to perform
  * @param thread The thread on which to perform the selector
@@ -1193,11 +1199,11 @@
 	     withObject: (nullable id)object1
 	     withObject: (nullable id)object2
 	     withObject: (nullable id)object3
 	     withObject: (nullable id)object4
 	     afterDelay: (of_time_interval_t)delay;
-#endif
+# endif
 
 /*!
  * @brief This method is called when @ref resolveClassMethod: or
  *	  @ref resolveInstanceMethod: returned false. It should return a target
  *	  to which the message should be forwarded.
@@ -1218,11 +1224,15 @@
  *
  * @param selector The selector not understood by the receiver
  */
 - (void)doesNotRecognizeSelector: (SEL)selector OF_NO_RETURN;
 @end
+#else
+typedef void OFObject;
+#endif
 
+#ifdef __OBJC__
 /*!
  * @protocol OFCopying OFObject.h ObjFW/OFObject.h
  *
  * @brief A protocol for the creation of copies.
  */
@@ -1270,10 +1280,11 @@
  * @param object An object to compare the object to
  * @return The result of the comparison
  */
 - (of_comparison_result_t)compare: (id <OFComparing>)object;
 @end
+#endif
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 #ifdef OF_APPLE_RUNTIME
@@ -1288,7 +1299,11 @@
 }
 #endif
 
 OF_ASSUME_NONNULL_END
 
-#import "OFObject+KeyValueCoding.h"
-#import "OFObject+Serialization.h"
+#ifdef __OBJC__
+# import "OFObject+KeyValueCoding.h"
+# import "OFObject+Serialization.h"
+#endif
+
+#endif