Fail Compiling SP on the final stage

Situation:

• you've got all the source files and libraries required
• you compile them one by one successfully
• you've seen a lot of warnings about existence of virtual functions without its virtual destructor
• you thought "oh, well, it's warning, no biggy" -- which most of the time is the 'correct' attitude from years of experience in compiling any C/C++ applications
• you tried to build the final stage: the shibboleth SP module and you've failed with errors

There are a number of possible reasons, but this are the most common ones:

• you've got incompatible libraries somewhere, check if your system has pre-existing openssl library for example. Choose the one which has been suggested, remove the other one.
• you have multiple gcc and g++ in the system, particularly you may have a much more recent gcc/++ (such as version 4.x). Shib SP has been tested to be working on v.3.3. Solution below will solve your problem (assuming they're running from /usr/bin):

  gcc --version
  g++ --version
  
  which gcc
  
  cd /usr/bin
  rm gcc; rm g++
  ln -s gcc-3.3 gcc
  ln -s g++-3.3 g++
  

Once you've sort out your problem, time to recompile every modules on shib SP.