Z3 is a theorem prover from Microsoft Research.
Z3 is licensed under MSR-LA (Microsoft Research License Agreement). 
See http://z3.codeplex.com/license for more information about this license.
Z3 can be built using Visual Studio Command Prompt and make/g++.

1) Building Z3 on Windows using Visual Studio Command Prompt
   
   python scripts/mk_make.py
   cd build
   nmake

2) Building Z3 using make/g++ and Python
Execute:

   python scripts/mk_make.py
   cd build
   make
   sudo make install

It will install z3 executable at /usr/bin, libraries at /usr/lib, and include files at /usr/include.
You can change the installation p

Use the following commands to install in a different prefix (e.g., /home/leo).

  python scripts/mk_make.py --prefix=/home/leo
  cd build
  make
  sudo make install

To uninstall Z3, use

  sudo make uninstall

3) Building Z3 using clang and clang++ on Linux/OSX
Remark: clang does not support OpenMP yet.   

   CXX=clang++ CC=clang python scripts/mk_make.py
   cd build
   make