diff -r e44f67656c5f -r 35cf5e2f110a config/companion_libs.in
--- a/config/companion_libs.in	Wed Feb 17 23:50:49 2010 +0100
+++ b/config/companion_libs.in	Wed Feb 17 23:41:17 2010 +0100
@@ -100,6 +100,20 @@
       can say 'Y' here, although it is unknown yet if any other component
       can use it.
 
+config LIBELF
+    bool
+#    prompt "libelf"
+    select COMPLIBS
+    select WRAPPER_NEEDED
+    help
+      gcc-4.5.0 and above can also use libelf to enable some optimisation
+      (LTO, Link-Time Optimisation, to be precise).  Although libelf is
+      optional, crosstool-NG requires it and uses it to build gcc >= 4.5.0.
+      
+      This will be automatically selected if you choose gcc>=4.5.0, but you
+      can say 'Y' here, although it is unknown yet if any other component
+      can use it.
+
 config GMP_TARGET
     bool
 
@@ -125,6 +139,9 @@
     select PPL_TARGET
     select CLOOG_TARGET
 
+config LIBELF_TARGET
+    bool
+
 if GMP || GMP_TARGET
 comment "GMP version needed to build for target"
     depends on !GMP
@@ -150,6 +167,11 @@
     depends on !MPC
 source config/companion_libs/mpc.in
 endif
+if LIBELF || LIBELF_TARGET
+comment "libelf version needed to build for target"
+    depends on !LIBELF
+source config/companion_libs/libelf.in
+endif
 
 config FOO
     bool