title: Issue Compiling Botan Using MinGW in Windows7 64bit
body: <p>I am trying to install the non-MSVC version of Botan to my environment. I downloaded the tarball, extracted the files, and ran configure.py</p>
  
  <p>After running configure.py, I run make, make fails with a "sorry, unimplemented: 64-bit mode not compiled in" error.</p>
  
  <p>What is this error caused by and how do I fix it?</p>
  
  <p>Output from configure.py:</p>
  
  <pre><code>INFO: Guessing target OS is windows (use --os to set)
  INFO: Guessing to use compiler gcc (use --cc to set)
  INFO: Guessing target processor is a x86_64/x86_64 (use --cpu to set)
  INFO: Target is gcc-windows-x86_64-x86_64
  INFO: Detected gcc version 4.6.1
  INFO: Assuming gcc has TR1 (use --with-tr1=none to disable)
  INFO: Skipping, by request only - bzip2 cms cvc gnump openssl qt_mutex zlib
  INFO: Skipping, dependency failure - sha1_x86_64
  INFO: Skipping, incompatible CPU - aes_ni aes_ssse3 md4_x86_32 md5_x86_32 mp_asm64 mp_x86_32 serpent_x86_32 sha1_x86_32 simd_altivec
  INFO: Skipping, incompatible OS - alloc_mmap asm_x86_32 asm_x86_64 beos_stats dev_random egd fd_unix proc_walk pthreads unix_procs
  INFO: Skipping, incompatible compiler - mp_msvc64 mp_x86_32_msvc
  INFO: Skipping, loaded only if needed by dependency - aes_isa_eng mp_generic simd_scalar
  INFO: Using MP module mp_x86_64
  INFO: Using SIMD module simd_sse2
  INFO: ssl: The SSL/TLS code is complex, new, and not yet reviewed, there may be serious bugs or security issues.
  INFO: Assuming CPU is little endian
  INFO: Assuming unaligned memory access works
  INFO: Using copy to link files into build directory
  INFO: Botan 1.10.1 build setup is complete
  </code></pre>
  
  <p>Output from make:</p>
  
  <pre><code>g++ -m64 -Ibuild\include -O3 -finline-functions  -D_REENTRANT -Wno-long-long -W -Wall -fPIC -fvisibility=hidden -c C:\Users\ben.zweber.IPHASE3\Downloads\Botan-1.10.1\src\algo_base\symkey.cpp -o build\lib\symkey.obj
  C:\Users\ben.zweber.IPHASE3\Downloads\Botan-1.10.1\src\algo_base\symkey.cpp:1:0: warning: -fPIC ignored for target (all code is position independent) [enabled by default]
  C:\Users\ben.zweber.IPHASE3\Downloads\Botan-1.10.1\src\algo_base\symkey.cpp:1:0: sorry, unimplemented: 64-bit mode not compiled in
  make: *** [build\lib\symkey.obj] Error 1
  </code></pre>