Fix CXX numbuf error message for Anaconda 3.6. (ray-project#258)

doc/install-on-macosx.md

@@ -14,6 +14,12 @@ brew install cmake automake autoconf libtool boost wget
 pip install numpy cloudpickle funcsigs colorama psutil redis --ignore-installed six
 ```
 
+If you are using Anaconda, you may also need to run the following.
+
+```
+conda install libgcc
+```
+
 # Install Ray
 
 Ray can be built from the repository as follows.

doc/install-on-ubuntu.md

@@ -15,6 +15,12 @@ sudo apt-get install -y cmake build-essential autoconf curl libtool libboost-all
 pip install numpy cloudpickle funcsigs colorama psutil redis
 ```
 
+If you are using Anaconda, you may also need to run the following.
+
+```
+conda install libgcc
+```
+
 # Install Ray
 
 Ray can be built from the repository as follows.

python/numbuf/__init__.py

@@ -13,10 +13,10 @@
 try:
   from core.src.numbuf.libnumbuf import *
 except ImportError as e:
-  if hasattr(e, "msg") and isinstance(e.msg, str) and "GLIBCXX" in e.msg:
+  if hasattr(e, "msg") and isinstance(e.msg, str) and ("libstdc++" in e.msg or "CXX" in e.msg):
     # This code path should be taken with Python 3.
     e.msg += helpful_message
-  elif hasattr(e, "message") and isinstance(e.message, str) and "GLIBCXX" in e.message:
+  elif hasattr(e, "message") and isinstance(e.message, str) and ("libstdc++" in e.message or "CXX" in e.message):
     # This code path should be taken with Python 2.
     if hasattr(e, "args") and isinstance(e.args, tuple) and len(e.args) == 1 and isinstance(e.args[0], str):
       e.args = (e.args[0] + helpful_message,)