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Editorial Team
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Asked: 2026-05-20T16:54:01+00:00

New to iPhone app development, I have a problem compiling (or Build and Run)

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New to iPhone app development, I have a problem compiling (or “Build and Run”) my application after including S7FTPRequest into my class library; before I even include it in any particular script. I get the following errors:

Undefined symbols:
"_kCFStreamPropertyFTPPassword", referenced from:
_kCFStreamPropertyFTPPassword$non_lazy_ptr in S7FTPRequest.o
(maybe you meant: _kCFStreamPropertyFTPPassword$non_lazy_ptr)
"_CFWriteStreamCreateWithFTPURL", referenced from:
-[S7FTPRequest startUploadRequest] in S7FTPRequest.o
-[S7FTPRequest startCreateDirectoryRequest] in S7FTPRequest.o
"_kCFStreamPropertyFTPUserName", referenced from:
 _kCFStreamPropertyFTPUserName$non_lazy_ptr in S7FTPRequest.o
 (maybe you meant: _kCFStreamPropertyFTPUserName$non_lazy_ptr)
"_kCFStreamErrorDomainFTP", referenced from:
 _kCFStreamErrorDomainFTP$non_lazy_ptr in S7FTPRequest.o
 (maybe you meant: _kCFStreamErrorDomainFTP$non_lazy_ptr)
ld: symbol(s) not found
collect2: ld returned 1 exit status

thx!

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1 Answer

  1. Editorial Team

    Ok I kinda gave up on this solution (for the time being) but I think I solved the issue when trying something different.

    It seems that many external components need some accommodating linked libraries.

    You can add new libraries by going to Project > Edit Active Target “ProjectName” > General

    Then you click the plus simple to see all the available libraries.

    Not sure which one fixed but I added these for a different solution and voila S7FTPRequest compiled.

    Here are the libraries I added (I think it was actually libz.1.2.3.dylib):

    CoreGraphics.framework
    CFNetwork.framework
    SystemConfiguration.framework
    MobileCoreServices.framework
    libz.1.2.3.dylib

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