Errors while installing IO (language)

I am trying to install IO on a macbook pro but am stuck at the following:

Linking CXX shared library _build/dll/libIoObjcBridge.dylib ld:

library not found for -lIoSocket collect2: ld returned 1 exit status

make[2]: * [addons/ObjcBridge/_build/dll/libIoObjcBridge.dylib]

Error 1 make[1]:开发者_JS百科 *

[addons/ObjcBridge/CMakeFiles/IoObjcBridge.dir/all] Error 2

Any suggestions?

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Install libevent. I did it with Homebrew.