Did you run “perl Configure VC-WIN32 –prefix=%OpenSSL%” with Visual Studio 2008 Command Prompt under the directory of your OpenSSL folder?

Example (for my test case here):
D:\openssl-1.0.0a>perl Configure VC-WIN32 –prefix=%OpenSSL%

Your results will be something like the following:

Configuring for VC-WIN32
    no-gmp          [default]  OPENSSL_NO_GMP (skip dir)
    no-jpake        [experimental] OPENSSL_NO_JPAKE (skip dir)
    no-krb5         [krb5-flavor not specified] OPENSSL_NO_KRB5
    no-md2          [default]  OPENSSL_NO_MD2 (skip dir)
    no-rc5          [default]  OPENSSL_NO_RC5 (skip dir)
    no-rfc3779      [default]  OPENSSL_NO_RFC3779 (skip dir)
    no-shared       [default]
    no-store        [experimental] OPENSSL_NO_STORE (skip dir)
    no-zlib         [default]
    no-zlib-dynamic [default]
IsMK1MF=1
CC            =cl
CFLAG         =-DOPENSSL_THREADS  -DDSO_WIN32 -W3 -WX -Gs0 -GF -Gy -nologo -DOPENSSL_SYSNAME_WIN32 -DWIN32_LEAN_AND_MEAN -DL_ENDIAN ... < more of the definitions here >
EX_LIBS       =
CPUID_OBJ     =x86cpuid.o
BN_ASM        =bn-586.o co-586.o x86-mont.o
DES_ENC       =des-586.o crypt586.o
AES_ENC       =aes-586.o
BF_ENC        =bf-586.o
CAST_ENC      =cast-586.o
RC4_ENC       =rc4-586.o
RC5_ENC       =rc5-586.o
MD5_OBJ_ASM   =md5-586.o
SHA1_OBJ_ASM  =sha1-586.o sha256-586.o sha512-586.o
RMD160_OBJ_ASM=rmd-586.o
CMLL_ENC=     =cmll-x86.o
PROCESSOR     =
RANLIB        =true
ARFLAGS       =
PERL          =perl
THIRTY_TWO_BIT mode
BN_LLONG mode
RC4_INDEX mode
RC4_CHUNK is undefined

Configured for VC-WIN32.

If you look at the CFLAG values, you will find -DOPENSSL_SYSNAME_WIN32, this actually disable the #include in the o_str.c

If look into the file o_str.c, you’ll see:

#if !defined(OPENSSL_IMPLEMENTS_strncasecmp) && \
    !defined(OPENSSL_SYSNAME_WIN32) && \
    !defined(NETWARE_CLIB)
# include 
#endif

So two checks here. First make sure you are running the command under Visual Studio Command Prompt and the CFLAG has the mentioned flag.

Also, you can open up the Configure file in the OpenSSL folder. Do a find on “OPENSSL_SYSNAME_WIN32″, you will see it in VC-WIN32 target. You can add it there or re-download the OpenSSL if it’s not there.

Hope it helps.

cl : Command line warning D9035 : option ‘O’ has been deprecated and will be rem
oved in a future release
o_str.c
.\crypto\o_str.c(66) : fatal error C1083: Cannot open include file: ‘strings.h’:
No such file or directory
NMAKE : fatal error U1077: ‘”C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN
\cl.EXE”‘ : return code ’0×2′
Stop.

Thanks!

If you have gone through the building of OpenSSL library, you’ll find libeay32.lib and ssleay32.lib in $(OpenSSL)\out32, depending on where you placed your OpenSSL folder (e.g. C:\OpenSSL\out32). Let me know if you have any problem getting that.

Of course, the compilation of OpenSSL can be removed by specifying a flag in the Preprocessor Definitions. However, I won’t go into it now. If you want to know more, do let me know.

It should reside in the folder where your libtorrent.dll located. It is created/compiled when you build the libtorrent DLL. My guess, if you didn’t change your project settings, it should be in the debug/release folder of in your solution folder (depending which configuration you build it with).

my email is:
power.eptin [a] gmail . com

thanks

If you link statically to the runtime library, you cannot build libtorrent as a shared library (DLL), since you will get separate heaps in the library and in the client application. It will result in crashes and possibly link errors.

I might be doing it wrong. If you can show me how to make a static version that would be awesome!