configure issue, probably trivial

Friends,

I'm running Ubutu 5.10 and I thought I would fool around with ht://Dig a
bit, so I downloaded a tarball, unpacked it, and ran ./configure.  I get the
following output:

 loading cache ./config.cache
 checking for a BSD compatible install... /usr/bin/install -c
 checking whether build environment is sane... yes
 checking whether make sets ${MAKE}... yes
 checking for working aclocal... found
 checking for working autoconf... found
 checking for working automake... found
 checking for working autoheader... found
 checking for working makeinfo... found
 configuring ht://Dig version 3.1.6
 checking for gcc... gcc
 checking whether the C compiler (gcc  ) works... yes
 checking whether the C compiler (gcc  ) is a cross-compiler... no
 checking whether we are using GNU C... yes
 checking whether gcc accepts -g... yes
 checking for c++... c++
 checking whether the C++ compiler (c++  ) works... yes
 checking whether the C++ compiler (c++  ) is a cross-compiler... no
 checking whether we are using GNU C++... yes
 checking whether c++ accepts -g... yes
 checking for ranlib... ranlib
 checking for ar... /usr/bin/ar
 checking for sh... /bin/sh
 checking for sed... /bin/sed
 checking for sort... /usr/bin/sort
 checking for find... /usr/bin/find
 checking for gunzip... /bin/gunzip
 checking for tar... tar
 checking for acroread... /usr/bin/acroread
 checking for sendmail... /usr/sbin/sendmail
 checking how to run the C preprocessor... gcc -E
 checking for AIX... no
 checking for socket in -lsocket... no
 checking for t_accept in -lnsl... no
 checking for deflate in -lz... no
 checking for ANSI C header files... yes
 checking whether time.h and sys/time.h may both be included... yes
 checking how to run the C++ preprocessor... c++ -E
 checking for fcntl.h... yes
 checking for limits.h... yes
 checking for malloc.h... yes
 checking for sys/file.h... yes
 checking for sys/ioctl.h... yes
 checking for sys/time.h... yes
 checking for unistd.h... yes
 checking for getopt.h... yes
 checking for strings.h... yes
 checking for zlib.h... no
 checking for alloca.h... yes
 checking for sys/select.h... yes
 checking for wait.h... yes
 checking for sys/wait.h... yes
 checking for malloc.h... (cached) yes
 checking for ostream.h... no
 checking for iostream.h... no
 checking for fstream.h... no
 configure: error: To compile ht://Dig, you will need a C++ library.
Try installing
   libstdc++.

But I have libstdc++!  In fact, in /usr/include/c++/4.0.2 there seem to be
the right files (albeit missing their ".h").

I think this is some simple C++ set-up thing (environment variables,
maybe?) --- can anyone help me?

Thanks!!!


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