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The error_logger_lager_h.erl uses macro overloading that was added in Erlang 5.7.5/OTP R13B04. Therefore, Lager cannot be compiled with Erlang/OTP R13B01.
Since this is the only blocking issue preventing Lager from running with OTP R13B01 I'd suggest to avoid overloading the LOG macro in error_logger_lager_h.erl and using two macros instead.
Sounds reasonable, want to make a pull request?
Sure! Pull request was added as the issue #94.