* INSTALL: Add note about older gcc and clang.

ChangeLog

@@ -1,3 +1,7 @@
+2013-11-08  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* INSTALL: Add note about older gcc and clang.
+
 2013-11-08  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* tests/util/grub-shell.in: Boot as hdd on ppc by default.

INSTALL

@@ -12,6 +12,10 @@ you don't have any of them, please obtain and install them before
 configuring the GRUB.
 
 * GCC 4.1.3 or later
+  Note: older versions may work but support is limited
+  Note: clang 3.2 or later works for i386 and x86_64 targets but results in
+        much bigger binaries.
+  Note: clang 3.4 or later works for powerpc
 * GNU Make
 * GNU Bison 2.3 or later
 * GNU gettext 0.17 or later