build-erlang-mk: add support for buildFlags

pkgs/development/beam-modules/build-erlang-mk.nix

@@ -12,6 +12,7 @@
 , configurePhase ? null
 , meta ? {}
 , enableDebugInfo ? false
+, buildFlags ? []
 , ... }@attrs:
 
 with stdenv.lib;
@@ -42,6 +43,10 @@ let
     buildInputs = [ erlang perl which gitMinimal wget ];
     propagatedBuildInputs = beamDeps;
 
+    buildFlags = [ "SKIP_DEPS=1" ]
+      ++ lib.optional (enableDebugInfo || erlang.debugInfo) ''ERL_OPTS="$ERL_OPTS +debug_info"''
+      ++ buildFlags;
+
     configurePhase = if configurePhase == null
     then ''
       runHook preConfigure
@@ -58,7 +63,7 @@ let
     then ''
         runHook preBuild
 
-        make SKIP_DEPS=1 ERL_OPTS="$ERL_OPTS ${debugInfoFlag}"
+        make $buildFlags "''${buildFlagsArray[@]}"
 
         runHook postBuild
     ''