--- trunk/livstidsfanger.c	2014/11/09 15:15:31	13
+++ trunk/livstidsfanger.c	2014/11/09 15:30:18	14
@@ -17,6 +17,10 @@
 #include <time.h>
 #include <unistd.h>
 
+#if _POSIX_THREADS < 200112L
+#error her mangler det støtte for POSIX Threads anno 2001
+#endif
+
 #if __STDC_VERSION__ >= 201112L
 #include <stdnoreturn.h>
 #else