AC_DEFINE_UNQUOTED(C_INCLUDE_DIRS,"$withval",
[Directories clang will search for headers])
+AC_ARG_WITH(cxx-include-root,
+ AS_HELP_STRING([--with-cxx-include-root],
+ [Directory with the libstdc++ headers.]),,
+ withval="")
+AC_DEFINE_UNQUOTED(CXX_INCLUDE_ROOT,"$withval",
+ [Directory with the libstdc++ headers.])
+
+AC_ARG_WITH(cxx-include-arch,
+ AS_HELP_STRING([--with-cxx-include-arch],
+ [Architecture of the libstdc++ headers.]),,
+ withval="")
+AC_DEFINE_UNQUOTED(CXX_INCLUDE_ARCH,"$withval",
+ [Arch the libstdc++ headers.])
+
+AC_ARG_WITH(cxx-include-32bit-dir,
+ AS_HELP_STRING([--with-cxx-include-32bit-dir],
+ [32 bit multilib dir.]),,
+ withval="")
+AC_DEFINE_UNQUOTED(CXX_INCLUDE_32BIT_DIR,"$withval",
+ [32 bit multilib directory.])
+
+AC_ARG_WITH(cxx-include-64bit-dir,
+ AS_HELP_STRING([--with-cxx-include-64bit-dir],
+ [64 bit multilib directory.]),,
+ withval="")
+AC_DEFINE_UNQUOTED(CXX_INCLUDE_64BIT_DIR,"$withval",
+ [64 bit multilib directory.])
+
dnl Allow linking of LLVM with GPLv3 binutils code.
AC_ARG_WITH(binutils-include,
AS_HELP_STRING([--with-binutils-include],