Error compiling OpenSSL for Win32

I get the following error when trying to build OpenSSL on Win32:

C:\Program Fil开发者_Python百科es (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\errno.h(92) : error C2220: warning treated as error - no 'object' file generated

C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\errno.h(92) : warning C4005: 'EADDRINUSE' : macro redefinition

tmp32\e_os.h(153) : see previous definition of 'EADDRINUSE'

NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\BIN\cl.EXE"' : return code '0x2' Stop.

I've followed the instructions in INSTALL.W32 to the letter. I configured with the no-asm flag. I am using Visual Studio Express 2010 C++.

Thank you for your time.

Apparently this a bug in OpenSSL 1.0.0. I downloaded the 1.0.0a source and it is compiling fine.