For some reason libtool 2.2.2 can't cope with this, LT_LANG(C++) works though.

RP - 14/4/08

Index: libusb-0.1.12/configure.in
===================================================================
--- libusb-0.1.12.orig/configure.in	2008-04-14 22:08:26.000000000 +0100
+++ libusb-0.1.12/configure.in	2008-04-14 22:09:43.000000000 +0100
@@ -149,7 +149,7 @@
 fi
 
 # Checks for programs.
-AC_LANG_CPLUSPLUS
+AC_PROG_CXX
 AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_INSTALL