ext/hash_map and configure checking

[Barnaby Gray]

I'm currently trying to get my configure script checking for the STL
headers I'm using in my C++ project. It was compiling fine with the
older libstdc++ v2 (?) headers in /usr/include/libstdc++-3, but I've
been testing it out with g++-3.0 and now it can't locate the hash_map
header because this has been put in the /usr/include/libstdc++-v3/ext
directory.

I'm trying to figure out the autoconf magic to get it to define
something so I can alter the #include's in my project to fit, but I'm
not too hot with autoconf - can anyone who might have had this problem
before lend a hand? I'm sorry if this isn't the best place to ask..

Thanks,

Barnaby

PS. Please CC to me as I'm not on the list.