Index: libcfa/src/concurrency/kernel/private.hfa
===================================================================
--- libcfa/src/concurrency/kernel/private.hfa	(revision 7f6a7c9815ca57db7bd45062dda4b61c275ad2ec)
+++ libcfa/src/concurrency/kernel/private.hfa	(revision 95dab9ec006307c04669f1d2832d144a7ff5a92f)
@@ -49,4 +49,16 @@
 #endif
 
+extern "C" {
+	__attribute__((visibility("protected"))) int __cfaabi_pthread_create(pthread_t *_thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg);
+	__attribute__((visibility("protected"))) int __cfaabi_pthread_join(pthread_t _thread, void **retval);
+	__attribute__((visibility("protected"))) pthread_t __cfaabi_pthread_self(void);
+	__attribute__((visibility("protected"))) int __cfaabi_pthread_attr_init(pthread_attr_t *attr);
+	__attribute__((visibility("protected"))) int __cfaabi_pthread_attr_destroy(pthread_attr_t *attr);
+	__attribute__((visibility("protected"))) int __cfaabi_pthread_attr_setstack( pthread_attr_t *attr, void *stackaddr, size_t stacksize );
+	__attribute__((visibility("protected"))) int __cfaabi_pthread_attr_getstacksize( const pthread_attr_t *attr, size_t *stacksize );
+	__attribute__((visibility("protected"))) int __cfaabi_pthread_sigqueue(pthread_t _thread, int sig, const union sigval value);
+	__attribute__((visibility("protected"))) int __cfaabi_pthread_sigmask( int how, const sigset_t *set, sigset_t *oset);
+}
+
 //-----------------------------------------------------------------------------
 // Scheduler
Index: libcfa/src/concurrency/kernel/startup.cfa
===================================================================
--- libcfa/src/concurrency/kernel/startup.cfa	(revision 7f6a7c9815ca57db7bd45062dda4b61c275ad2ec)
+++ libcfa/src/concurrency/kernel/startup.cfa	(revision 95dab9ec006307c04669f1d2832d144a7ff5a92f)
@@ -219,5 +219,5 @@
 		( this.runner ){};
 		init( this, "Main Processor", *mainCluster, 0p );
-		kernel_thread = real_pthread_self();
+		kernel_thread = __cfaabi_pthread_self();
 
 		runner{ &this };
@@ -779,5 +779,5 @@
 	pthread_attr_t attr;
 
-	check( real_pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
+	check( __cfaabi_pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
 
 	size_t stacksize = max( PTHREAD_STACK_MIN, DEFAULT_STACK_SIZE );
@@ -806,11 +806,11 @@
 	#endif
 
-	check( real_pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" );
-	check( real_pthread_create( pthread, &attr, start, arg ), "pthread_create" );
+	check( __cfaabi_pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" );
+	check( __cfaabi_pthread_create( pthread, &attr, start, arg ), "pthread_create" );
 	return stack;
 }
 
 void __destroy_pthread( pthread_t pthread, void * stack, void ** retval ) {
-	int err = real_pthread_join( pthread, retval );
+	int err = __cfaabi_pthread_join( pthread, retval );
 	if( err != 0 ) abort("KERNEL ERROR: joining pthread %p caused error %s\n", (void*)pthread, strerror(err));
 
@@ -818,9 +818,9 @@
 		pthread_attr_t attr;
 
-		check( real_pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
+		check( __cfaabi_pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
 
 		size_t stacksize;
 		// default stack size, normally defined by shell limit
-		check( real_pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
+		check( __cfaabi_pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
 		assert( stacksize >= PTHREAD_STACK_MIN );
 		stacksize += __page_size;