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Asked: 2026-05-15T01:07:28+00:00

I’m trying to use standard system header files in my C++ XCode project: #include

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I’m trying to use standard system header files in my C++ XCode project:

#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

The build fails and it complains:

"Openssl/bio.h: No such file or directory"

I added /usr/include to the “Header Search Paths” in Project settings, but that doesn’t fix it.

I can fix it by adding the whole path like:

#include </usr/include/openssl/bio.h>

— but the project is full of similar includes and I don’t want to change all of them this way. Also, I feel I shouldn’t have to do this.

Another way to fix it would be as another thread mentioned, which is to add /usr/include to User Header Search Paths. But if I do that, then I’d have to change all the angle brackets <> to quotes “”, which again seems like a hack. I mean, these are standard system header files so I feel it should be something simple, not requiring these kinds of hacks.

Any ideas?

Thanks!

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1 Answer

  1. Editorial Team

    Xcode uses the currently selected SDK as a base path, which it prefixes on to system includes. So if your SDK is /Developer/SDKs/MacOSX10.6.sdk then it will look under /Developer/SDKs/MacOSX10.6.sdk/usr/include by default for system includes.

    There are various possible workarounds – I would probably just put a symbolic link in /Developer/SDKs/MacOSX10.6.sdk/usr/include pointing at /usr/include/openssl but you can probably think of others now that you know the underlying problem.

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