In Ubuntu run make from the c/omfDemo/omfDemo directory， show /usr/bin/ld: cannot find -lcurl
What version of OMF Relay are you using?
This is a generic error, ld the loader) does not know about where your project library (here curl) is located. You have to place it into ld's known directories or specify the full path of your library by -L parameter to the linker.
Can you try to resolve the issue by following /usr/bin/ld: cannot find -lOpenCL example
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