extend/erlang.mk — pull request #11 by goofansu (2013-06-20 11:13:38+00:00)
Title: Fix include error for compile_erl

My project's structure is like following:

```
src/
include/
priv/
...
```

When I use make app to compile my project, it reports `can't find include file "xxx.hrl".`

Edited to below 80 columns.