--- src/wefts_os_pthread.cpp.old	2004-12-31 04:50:28.692237472 +0900
+++ src/wefts_os_pthread.cpp	2004-12-31 04:50:56.914946968 +0900
@@ -19,7 +19,7 @@
 ***************************************************************************/
 
 #include <wefts_os.h>
-
+#include <sys/errno.h>
 
 /** \file
    Pthread OS layer implementation static routines.