Installation of libstdc++-v3 headers

[Benjamin Kosnik]

>If you do not specify enable_version_specific_runtime_libs, or
>gxx_include_dir, you should hit it.  Do you get a reference to
>${libstdcxx_incdir} in libstdc++-v3/Makefile?

No.

Instead, I get

/mnt/hd/bld/bld-x86-gcc-3_2-branch/i686-pc-linux-gnu/libstdc++-v3/Makefile
gxx_include_dir = $(prefix)/include/c++/3.2.1

>Your Make might be putting libstdcxx_incdir into the environment, or
>something...

I'm not doing anything special. 

%make --version
GNU Make version 3.79.1

#!/bin/sh
# This file was generated automatically by configure.  Do not edit.
# This directory was configured as follows:
/mnt/hd/src/gcc-3_2-branch/configure --with-gcc-version-trigger=/mnt/hd/src/gcc-3_2-branch/gcc/version.c --host=i686-pc-linux-gnu --verbose --prefix=/mnt/hd/bld/H-x86-gcc-3_2-branch --enable-languages=c,c++ --enable-__cxa_atexit --norecursion