Index: libcfa/src/concurrency/kernel/startup.cfa
===================================================================
--- libcfa/src/concurrency/kernel/startup.cfa	(revision 97229d6d4d0603b4f97fac22b55c583eb89341e1)
+++ libcfa/src/concurrency/kernel/startup.cfa	(revision 42f6e07e6f562d26e2a4c552e12cfcd2f2660dce)
@@ -117,5 +117,5 @@
 }
 
-size_t __page_size = 0;
+extern size_t __page_size;
 
 //-----------------------------------------------------------------------------
@@ -161,6 +161,4 @@
 	/* paranoid */ verify( ! __preemption_enabled() );
 	__cfadbg_print_safe(runtime_core, "Kernel : Starting\n");
-
-	__page_size = sysconf( _SC_PAGESIZE );
 
 	__cfa_dbg_global_clusters.list{ __get };
@@ -681,5 +679,5 @@
 	#if CFA_PROCESSOR_USE_MMAP
 		stacksize = ceiling( stacksize, __page_size ) + __page_size;
-		stack = mmap(0p, stacksize, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+		stack = mmap(0p, stacksize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
 		if(stack == ((void*)-1)) {
 			abort( "pthread stack creation : internal error, mmap failure, error(%d) %s.", errno, strerror( errno ) );