Github user iilyak commented on a diff in the pull request:
https://github.com/apache/couchdb/pull/348#discussion_r40696130
--- Diff: rebar.config.script ---
@@ -15,6 +15,18 @@
ConfigureEnv = filename:join(filename:dirname(SCRIPT), "config.erl"),
os:putenv("COUCHDB_CONFIG", ConfigureEnv).
+OTP_VSN = erlang:system_info(compat_rel),
+
+Features = lists:filter(fun({_K, Flag}) -> Flag end, [
+ {'HAS_CALLBACKS', OTP_VSN > 14}
+]),
+
+Properties = Features ++ [
+ {'OTP_VSN', OTP_VSN},
+ {'OTP_RELEASE', erlang:system_info(otp_release)}
+],
--- End diff --
The reason I didn't hardcoded defines as `[{d, Key, Value}]` is to be able
to define some macro from the content of `config.erl`. But I didn't do a second
step to actually use `config.erl`. I'll update the PR with @rnewson's solution.
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