diff --git a/cpukit/ChangeLog b/cpukit/ChangeLog
index 883373bba1..f2915967ca 100644
--- a/cpukit/ChangeLog
+++ b/cpukit/ChangeLog
@@ -1,3 +1,7 @@
+2010-04-12	Ralf Corsépius <ralf.corsepius@rtems.org>
+
+	* configure.ac: Check for flockfile, funlockfile, ftrylockfile.
+
 2010-04-12	Chris Johns <chrisj@rtems.org>
 
 	libfs/src/rfs/rtems-rfs-buffer-bdbuf.c,
diff --git a/cpukit/configure.ac b/cpukit/configure.ac
index 6a9b0a5b7f..d5b1cd2378 100644
--- a/cpukit/configure.ac
+++ b/cpukit/configure.ac
@@ -56,6 +56,10 @@ AC_CHECK_FUNCS([creat])
 AC_CHECK_FUNCS([__assert])
 AC_CHECK_FUNCS([execl execlp execle execv execvp execve])
 AC_CHECK_FUNCS([regcomp regexec regerror regfree])
+# Mandated by POSIX but not present in newlib
+AC_CHECK_DECLS([flockfile],[AC_CHECK_FUNCS([flockfile])],,[#include <stdio.h>])
+AC_CHECK_DECLS([funlockfile],[AC_CHECK_FUNCS([funlockfile])],,[#include <stdio.h>])
+AC_CHECK_DECLS([ftrylockfile],[AC_CHECK_FUNCS([ftrylockfile])],,[#include <stdio.h>])
 
 # Newlib's unix/ directory
 AC_CHECK_FUNCS([ttyname getcwd])