diff --git a/usr/lib/emscripten/tools/shared.py b/usr/lib/emscripten/tools/shared.py
index a5415ae..8e6d989 100644
--- a/usr/lib/emscripten/tools/shared.py
+++ b/usr/lib/emscripten/tools/shared.py
@@ -291,7 +291,7 @@ CLANG_ADD_VERSION = None
 CLOSURE_COMPILER = None
 EMSCRIPTEN_NATIVE_OPTIMIZER = None
 JAVA = None
-JS_ENGINES = []
+JS_ENGINES = ['node']
 COMPILER_OPTS = []
 FROZEN_CACHE = False
 
diff --git a/usr/lib/emscripten/tools/system_libs.py b/usr/lib/emscripten/tools/system_libs.py
index 81bd6d1..bb2a297 100755
--- a/usr/lib/emscripten/tools/system_libs.py
+++ b/usr/lib/emscripten/tools/system_libs.py
@@ -47,7 +47,7 @@ def get_cflags(force_object_files=False):
   if shared.Settings.WASM_BACKEND:
     # musl, compiler-rt, etc use ints in bool contexts in many places, like
     #  (x << 10) ? y : z
-    flags += ['-Wno-int-in-bool-context']
+    pass
   return flags
 
 
@@ -217,7 +217,7 @@ class Library(object):
 
   # A list of flags to pass to emcc.
   # The flags for the parent class is automatically inherited.
-  cflags = ['-Werror']
+  cflags = []
 
   # A list of directories to put in the include path when building.
   # This is a list of tuples of path components.
@@ -733,6 +733,9 @@ class libcxxabi(CXXLibrary, MTLibrary, NoExceptLibrary):
   name = 'libc++abi'
   depends = ['libc']
   cflags = ['-std=c++11', '-Oz', '-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS']
+  includes = [
+    ['system', 'lib', 'libunwind', 'include'],
+  ]
 
   def get_cflags(self):
     cflags = super(libcxxabi, self).get_cflags()