Compile time ERROR on redhat enterprise linux 4 about gperftools HOT 4 CLOSED

Can you check if you actually do have hash_map installed on your system 
somewhere? 
Perhaps use 'locate'.  Or else something like
   find /usr/include /usr/local/include --name hash_map

hash_map is part of libstdc++-devel in RHEL 4 and is found in (from RHEL 4.5's
libstdc++-devel-3.4.6-8) :

  /usr/include/c++/3.4.3/ext/hash_map

the failed test is not because hash_map is missing, but because g++ is not 
installed
as shown by config.log and the list of installed packages.

that should had been flagged earlier as a fatal error to the AC_PROG_CXX 
autoconf
macro though but the solution is to install gcc-c++ :

  up2date gcc-c++

attached an simple patch (not tested because of the missing aclocal macros in
"../autoconf") that add that test

I guess the question is, how far do we need to go with this kind of explicit 
checking
in the configure script.  Do we need to check that CC exists as well, and AR 
and LD
and all the rest?

I think the problem is that the hash_map configure-macro dies if it can't find a
hash_map, so it seems like the problem is with hash_map even though it's really 
more
general than that.  I've got a fix pending for the configure-death, so the 
macro will
just warn rather than fail.  After that fix is in, the configure will succeed 
(with a
warning), and then when you try to make, you'll get an error message like 'g++: 
not
found', which is pretty descriptive.