<p>I'm using libcurl in a Win32 C++ application.</p>

<p>I have the curllib.vcproj project added to my solution and set my other projects to depend on it.</p>

<p>How do I build it with SSL support enabled?</p>

Well, since this post failed badly, I had to dig into the matter myself.
Also check out the other answers and comments for additional info regarding other versions etc.
EDIT: Since I posted this Q there seems to be ready-built binaries made available from the curl homepage. Check out
James' answer
.
So here goes:
-
Preprocessor
The following two symbols need to be fed to the preprocessor to enable SSL for libcurl:
```
```
USE_SSLEAY
USE_OPENSSL
```
```
(libcurl uses OpenSSL for SSL support)
Alternatively the symbols can be added directly to a file called setup.h in libcurl, but I'm not too happy about modifying code in 3rd party distributions unless I really have to.
Rebuilding the libcurl library, I now got some errors about OpenSSL include files not being found. Naturally, since I haven't set up the OpenSSL distribution properly yet.
Compiling OpenSSL binaries
I downloaded the OpenSSL 0.9.8 source distribution and unpacked it.
In the root of the source distribution there's a file called INSTALL.W32 which describes how to compile the OpenSSL binaries. The build chain requires perl, so I installed the latest version of ActivePerl.
I had some trouble with the build, which might not be applicable to all systems, but I'll go through it here in case somebody experiences the same.
According to INSTALL.W32:
Run the following commandline tasks with current directory set to the source distribution root:
```
```
1> perl Configure VC-WIN32 --prefix=c:/some/openssl/dir
```
```
(Where "c:/some/openssl/dir" should be replaced by the dir where OpenSSL should be installed. Don't use spaces in this path. The compilation further ahead will fail in that case)
```
```
2> ms\do_ms
```
```
For me this step was unsuccessful at first, since I lacked the environment variables OSVERSION and TARGETCPU. I set these to
5.1.2600
and
x86
respectively. You may get complaint about OSVERSION being "insane", but look closer, this error is for WinCE and doesn't affect the Win32 setup. To get hold of your OS version, run the 'ver' command from a command prompt or run winver.exe.
```
```
3> nmake -f ms\nt.mak (for static library)
```
```
or
```
```
3> nmake -f ms\ntdll.mak (for DLL)
```
```
The source now compiles. Took approx 5 minutes on my laptop.
When compilation is completed, the libs or binaries have been placed in:
distroot/out32
- for static library build
or
distroot/out32dll
- for DLL build
Building and linking
Now, back to visual studio and point out the libs and include path for headers. The include files are located in
distroot/inc32/openssl
.
Remember to add
libeay32.lib
and
ssleay32.lib
as linker input.
Rebuild the libcurl project.
Error!
Well at least for me with this version of OpenSSL. 
it complained about a struct typedef in one of the OpenSSL headers. I couldn't find any info on this. After an hour of googling I broke my own principle and commented out the typedef from the OpenSSL header, and luckily libcurl wasn't using that symbol so it built fine.
Update: As pointed out by Jason, this issue seems to have dissapeared as of version 1.0.0a.
Now, for confirming that SSL support is enabled for libcurl, run the following code:
```
```
curl_version_info_data * vinfo = curl_version_info( CURLVERSION_NOW );
if( vinfo->features & CURL_VERSION_SSL )
    // SSL support enabled
else
    // No SSL
```
```
Simple as that.