[Openvpn-users] Building OpenVPN in MinGW

[Mathias Sundman <mathias@xxxxxxxxxx>]

While builing OpenVPN on Windows, many people have problems with building 
OpenSSL, including me the first time. Therefor I attempted to use the 
binary distribuition of OpenSSL so I could put together a more easy to 
follow instuction on how to build OpenVPN and OpenVPN GUI.

By default the binary distribution of OpenSSL installs itself in 
c:\OpenSSL with the libraries (.a files) in c:\OpenSSL\lib\minGW.

So in OpenVPN's makefile.w32 I had to change

OPENSSL = /c/src/openssl-0.9.7e
LIB_DIRS = -L${OPENSSL}/out -L${LZO}

to

OPENSSL = /c/OpenSSL
LIB_DIRS = -L${OPENSSL}/lib/MinGW -L${LZO}

Even after these changes I got the following compile error:

c:\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\mingw32\bin\ld.exe: 
cannot find -lssl32

To get around this problem, I renamed ssleay32.a to libssl32.a. Then it 
found the library.

Q1: Why did I have to rename ssleay32.a? It doesn't seem like the "right" 
way to solve the problem.


Then the linking failed because it couldn't find the lzo library.

I changed
LZO = /c/src/lzo-1.08
to
LZO = ../lzo-1.08

which was the correct path in my installation, but I found that the libs 
were created in the src/.libs dir, so I changed

LIB_DIRS = -L${OPENSSL}/lib/MinGW -L${LZO}
to
LIB_DIRS = -L${OPENSSL}/lib/MinGW -L${LZO}/src/.libs

and openvpn.exe could finaly be built.

Q2: Did I do anything wrong while building LZO, or why did I have to 
change the path to the lzo library in LIB_DIRS?

James, what do you think about changing makefile.w32 to match a default 
installtion of the binary OpenSSL distribution instead of the source 
distribuition? I think very few windows users have any use for the OpenSSL 
source, so they could avoid going through the trouble with building 
OpenSSL just to build OpenVPN.

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Mathias Sundman                  (^)   ASCII Ribbon Campaign
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