ds.babylonHxEx6 brsmith$ lime test emscripten
emcc Export/emscripten/obj/Main.cpp -o Export/emscripten/obj/Main.o
emcc Main.o /usr/lib/haxe/lib/hxcpp/3,1,39/lib/Emscripten/libstd.a /usr/lib/haxe/lib/hxcpp/3,1,39/lib/Emscripten/libregexp.a /usr/lib/haxe/lib/hxcpp/3,1,39/lib/Emscripten/libzlib.a /usr/lib/haxe/lib/lime/2,0,0/legacy/ndll/Emscripten/liblime.a /usr/lib/haxe/lib/lime/2,0,0/legacy/ndll/Emscripten/liblibfreetype.a ApplicationMain.a -o ApplicationMain.o
ERROR root: /usr/lib/haxe/lib/lime/2,0,0/legacy/ndll/Emscripten/liblime.a: No such file or directory ("/usr/lib/haxe/lib/lime/2,0,0/legacy/ndll/Emscripten/liblime.a" was expected to be an input file, based on the commandline arguments provided)
So in short it looks like /liblime.a is not available and rebuilding it with -Dlagacy is not building that file.