diff --git a/ap/build/uClibc/libm/carg.c b/ap/build/uClibc/libm/carg.c
new file mode 100644
index 0000000..7b290b0
--- /dev/null
+++ b/ap/build/uClibc/libm/carg.c
@@ -0,0 +1,29 @@
+/* Compute argument of complex double value.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <complex.h>
+#include <math.h>
+
+double
+carg (__complex__ double x)
+{
+  return atan2 (__imag__ x, __real__ x);
+}
+libm_hidden_def(carg)