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Editorial Team
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Asked: 2026-05-23T03:10:29+00:00

My application builds and runs fine on 10.6. I have Base SDK set to

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My application builds and runs fine on 10.6. I have Base SDK set to 10.6 and Mac OS X Deployment Target set to 10.5.

My application uses the system libcurl.dylib — instead of adding the dylib to the project, I just add -lcurl to the linker flags in build settings. (Though I have tried it both ways.)

When I launch the application on 10.5.8, I get the following error

Dyld Error Message: Library not loaded: /usr/lib/libcurl.4.dylib

Referenced from: /Applications/My Application.app/Contents/MacOS/MyApplication

Reason: Incompatible library version:

MyApplication requires version 6.0.0 or
later, but libcurl.4.dylib provides
version 5.0.0

Sure enough, if I otool -L the application’s binary, I get the following for libcurl:

/usr/lib/libcurl.4.dylib (compatibility version 6.0.0, current version 6.1.0)

Is there any way around this, or should I just statically link my own libcurl build?

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1 Answer

  1. Editorial Team

    Have you tried setting the Base SDK to 10.5 as well?

    $ otool -L /Developer/SDKs/MacOSX10.6.sdk/usr/lib/libcurl.4.dylib
/Developer/SDKs/MacOSX10.6.sdk/usr/lib/libcurl.4.dylib:
    /usr/lib/libcurl.4.dylib (compatibility version 6.0.0, current version 6.1.0)
    ...]
$ otool -L /Developer/SDKs/MacOSX10.5.sdk/usr/lib/libcurl.4.dylib
/Developer/SDKs/MacOSX10.5.sdk/usr/lib/libcurl.4.dylib:
    /usr/lib/libcurl.4.dylib (compatibility version 5.0.0, current version 5.0.0)
    [...]
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