Thanks for the response Chris,

For legacy reasons, I need to include OpenSSL and I’ve been using my own build 
of it for a long while now, without dependency on the OS X included headers. 
It’s always just worked, until Xcode 7.1. For what it’s worth, when I factor 
out the OpenSSL dependency, I then get stuck with a similar issue with the 
leptonica library. So apparently I need to look further than simply an issue 
with OpenSSL.

Thanks,
António

> On 12 Nov 2015, at 01:29, Chris Hanson <[email protected]> wrote:
> 
> On Nov 6, 2015, at 9:50 PM, Antonio Nunes <[email protected]> wrote:
>> 
>> Since updating to Xcode 7.1 my project no longer builds because Xcode 
>> because “bn.h” file not found. I include my own built copy of the openssl 
>> libraries and header in the project, within a subdirectory of the project 
>> directory. I made sure that Always search user paths is on, and I have a 
>> reference to the openssl headers directory in User Header Search Paths. Yet, 
>> where I try to include bn.h, I get the message  “bn.h” file not found. Any 
>> pointers on how to fix this?
> 
> In general, developers should use CommonCrypto to take the most advantage of 
> the OS-provided cryptography and security implementations. If there are 
> things you need to do that can’t be done with CommonCrypto, please file 
> detailed bugs at <http://bugreport.apple.com/>.
> 
> The OpenSSL headers included in the OS X and iOS SDKs have been deprecated 
> for a long time, and are now entirely removed from the operating system SDKs. 
> They have never formally been part of the supported operating system API, 
> just part of the included Open Source libraries, and the fact that OpenSSL 
> does not provide a guarantee of release-to-release binary compatibility has 
> been problematic in the past.
> 
>  -- Chris
> 
> 


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