Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -339,10 +339,11 @@
 	BUILDSYS_FRAMEWORK([
 		AC_SUBST(OBJFW_FRAMEWORK, "ObjFW.framework")
 		build_framework="yes"
 	])
 ], [
+	AC_DEFINE(OF_NO_SHARED, 1, [Whether no shared library was built])
 	AC_SUBST(LIBOBJFW_DEP, "../src/libobjfw.a")
 	AC_SUBST(LIBOBJFW_DEP_LVL2, "../../src/libobjfw.a")
 ])
 
 AS_IF([test x"$build_framework" = x"yes"], [

Index: src/block.h
==================================================================
--- src/block.h
+++ src/block.h
@@ -41,11 +41,12 @@
 extern "C" {
 #endif
 extern void *_Block_copy(const void *);
 extern void _Block_release(const void *);
 
-# ifdef OF_WINDOWS
+# if defined(OF_WINDOWS) && \
+    (defined(OF_NO_SHARED) || defined(OF_COMPILING_OBJFW))
 /*
  * Clang has implicit declarations for these, but they are dllimport. When
  * compiling ObjFW itself or using it as a static library, these need to be
  * dllexport. Interestingly, this still works when using it as a shared library.
  */

Index: src/objfw-defs.h.in
==================================================================
--- src/objfw-defs.h.in
+++ src/objfw-defs.h.in
@@ -40,12 +40,13 @@
 #undef OF_HAVE_UNICODE_TABLES
 #undef OF_HAVE__THREAD_LOCAL
 #undef OF_HAVE___THREAD
 #undef OF_NINTENDO_3DS
 #undef OF_NINTENDO_DS
+#undef OF_NO_SHARED
 #undef OF_OBJFW_RUNTIME
 #undef OF_UNIVERSAL
 #undef OF_WII
 #undef SIZE_MAX
 #undef UINTPTR_MAX
 #undef ULLONG_MAX
 #undef __have_longlong64

Index: tests/OFBlockTests.m
==================================================================
--- tests/OFBlockTests.m
+++ tests/OFBlockTests.m
@@ -70,11 +70,11 @@
 
 	TEST(@"Class of stack block",
 	    (Class)&_NSConcreteStackBlock == objc_getClass("OFStackBlock") &&
 	    [s isKindOfClass: [OFBlock class]])
 
-#if !defined(OF_WINDOWS) || !defined(__clang__)
+#if !defined(OF_WINDOWS) || !defined(__clang__) || !defined(OF_NO_SHARED)
 	/*
 	 * Causes a linker error on Windows with Clang when compiling as a
 	 * static library. This is a bug in Clang.
 	 */
 	TEST(@"Class of global block",