diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index bd7895635..60720f617 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,7 @@
+2006-12-13  Joel Schopp <jschopp@austin.ibm.com>
+
+        * newlib/include/alloca.h: add undef alloca to work with xlc
+
 2006-12-12  Joel Schopp <jschopp@austin.ibm.com>
 
         * libc/include/machine/setjmp.h[__SPU__]: Redefine _JBTYPE for 
diff --git a/newlib/libc/include/alloca.h b/newlib/libc/include/alloca.h
index 42439e370..2ea0fd9b3 100644
--- a/newlib/libc/include/alloca.h
+++ b/newlib/libc/include/alloca.h
@@ -10,6 +10,8 @@
 #include "_ansi.h"
 #include <sys/reent.h>
 
+#undef alloca
+
 #ifdef __GNUC__
 #define alloca(size) __builtin_alloca(size)
 #else