[DOC] More detailed installation instruction (#262)

* [DOC] More detailed installation instruction

* fix lang

docs/how_to/install.md

@@ -72,6 +72,9 @@ There are several ways to install the package:
 
     ```bash
     # install tvm package for the current user
+    # NOTE: if you installed python via homebrew, --user is not needed during installaiton
+    #       it will be automatically installed to your user directory.
+    #       providing --user flag may trigger error during installation in such case.
     cd python; python setup.py install --user
     # or install tvm package system wide
     cd python; sudo python setup.py install

make/config.mk

@@ -29,7 +29,7 @@ ADD_CFLAGS =
 # Backend runtimes.
 #---------------------------------------------
 # whether enable CUDA during compile
-USE_CUDA = 1
+USE_CUDA = 0
 
 # whether enable OpenCL during compile
 USE_OPENCL = 0