Update README.md

README.md

@@ -32,6 +32,8 @@ If you do not see the `isgx` device, you need to troubleshoot your driver instal
 
 # Install automake 1.15
 
+Currently the build builds with automake 1.15. You need to install it since Ubuntu 18 comes with automake 1.16 by default.
+
 ```cd scripts; sudo dpkg -i automake_1.15.1-3ubuntu2_all.deb ```
 
 # Install autoconf
@@ -63,3 +65,9 @@ To build sgxd, cd to project top dir and run `make`
 ## Running sgxwallet
 
 Type `./sgxwallet`
+
+## Development
+
+Note that `configure, Makefile` and `Makefile.in` files are created by `automake` tools on the fly.  
+Please do not add these files to the source tree!
+