OpenSSL Windows, How to compile

For PHP suitable sources and up-to-date information see

Building OpenSSL 0.9.8



Configure for Win32

cd  C:\phpbuild\libs\openssl-0.9.8k
perl Configure --openssldir=C:/phpbuild/apps_install/ VC-WIN32

Configure for Win64

cd  C:\phpbuild\libs\openssl-0.9.8k
perl Configure --openssldir=C:/phpbuild/apps_install/ VC-WIN64A

The configure will prepare the sources to compile OpenSSL for windows 32bit and install it under c:\phpbuilds\apps.

Modify the path using your configurations. Please note the unix directory separators / instead of the Windows backslash \.

The following steps are only for 0.9.8k, later versions have been fixed.

The headers are not compatible with VC9 which seems to be more picky. The openssl/ossl_typ.h header has a forward typedef that reads:
typedef struct ocsp_response_st OCSP_RESPONSE;
ocsp_response_st is defined in openssl/ocsp.h, this typedef has to be move there.
bufferoverflowu.lib is also not present anymore (not needed) in VC9. Comment out the reference in the util/pl/ script on line 142, 276 and 286.

Assembly languages options

PHP build default in 5.2 don't use ASM. PHP build default in 5.3 and later uses ASM.

For 0.9.8k you have to modify  the file crypto\perlasm\ On the line 273 remove "$extra".

For Win64 builds, use only:


For win32 builds only:

If you don't want to use assembly language:


If you like to use the assembly language files:

If you have MASM (aka “ml”), run:


Or if you use NASM:


You should not get any error until now. If you see errors messages, please check the troubleshooting section in “INSTALL.W32” in the OpenSSL sources.

And for win64:



nmake -f ms\ntdll.mak

If you prefer to build a static library, use this command:

nmake -f ms\nt.mak

If you get the following compilation error (with other letters):

.\crypto\cversion.c(105) : warning C4129: 'p' : unrecognized character escape sequence
.\crypto\cversion.c(105) : warning C4129: 'l' : unrecognized character escape sequence

Go back to the configure phase and be sure to use only slashed and no backslashes for --openssldir (or --prefix)


The possible point of failures in the OpenSSL implementations are numerous. Thanks to their tests suite, it is possible to minimize the risk by running it after each update:

nmake -f ms\ntdll.mak test


nmake -f ms\ntdll.mak install


nmake -f ms\nt.mak install

if you built the static library.

Copy OpenSSL 0.9.8 development files in the PHP SDK

To be done

Copy OpenSSL 0.9.8 in the PHP release Template

To be done

internals/windows/libs/openssl.txt · Last modified: 2017/09/22 13:28 by