diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3e0c8688..b6823e74 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -7,9 +7,12 @@ YCM to work on my machine" and the reason why is obviously related to your
 machine configuration and the problem would not be resolved with _reasonable_
 changes to the YCM codebase, then the issue is likely to be closed.
 
+**A good place to ask questions is the [ycm-users][] Google group**. Rule of
+thumb: if you're not sure whether your problem is a real bug, ask on the group.
+
 **YCM compiles just fine**; [the build bots say so][build-bots]. If the bots are
 green and YCM doesn't compile on your machine, then _your machine is the root
-cause_. Now read the previous paragraph again.
+cause_. Now read the first paragraph again.
 
 Realize that quite literally _thousands_ of people have gotten YCM to work
 successfully so if you can't, it's probably because you have a peculiar
@@ -25,6 +28,8 @@ Further, **search the issue tracker for similar issues** before creating a new
 one. There's no point in duplication; if an existing issue addresses your
 problem, please comment there instead of creating a duplicate.
 
+You should also **search the archives of the [ycm-users][] mailing list**.
+
 Lastly, **make sure you are running the latest version of YCM**. The issue you
 have encountered may have already been fixed. **Don't forget to recompile
 ycm_core.so too** (usually by just running `install.sh` again).
@@ -80,3 +85,4 @@ Creating good pull requests
     change is known. _What goal are you trying to accomplish?_
 
 [build-bots]: https://travis-ci.org/Valloric/YouCompleteMe
+[ycm-users]: https://groups.google.com/forum/?hl=en#!forum/ycm-users
diff --git a/README.md b/README.md
index 65767a6f..e6ea221b 100644
--- a/README.md
+++ b/README.md
@@ -240,16 +240,22 @@ notify you to recompile it. You should then rerun the install process.
 
     Now we need to generate the makefiles. If you DON'T care about semantic
     support for C-family languages, run the following command in the `ycm_build`
-    directory: `cmake -G "Unix Makefiles" . ~/.vim/bundle/YouCompleteMe/cpp`
+    directory: 
+    
+        cmake -G "Unix Makefiles" . ~/.vim/bundle/YouCompleteMe/cpp
 
     If you DO care about semantic support for C-family languages, then your
     `cmake` call will be a bit more complicated.  We'll assume you downloaded a
     binary distribution of LLVM+Clang from llvm.org in step 3 and that you
     extracted the archive file to folder `~/ycm_temp/llvm_root_dir` (with `bin`,
     `lib`, `include` etc. folders right inside that folder). With that in mind,
-    run the following command in the `ycm_build` directory: `cmake -G "Unix Makefiles" -DPATH_TO_LLVM_ROOT=~/ycm_temp/llvm_root_dir . ~/.vim/bundle/YouCompleteMe/cpp`
+    run the following command in the `ycm_build` directory:
+    
+        cmake -G "Unix Makefiles" -DPATH_TO_LLVM_ROOT=~/ycm_temp/llvm_root_dir . ~/.vim/bundle/YouCompleteMe/cpp
 
-    Now that makefiles have been generated, simply run `make ycm_core`.
+    Now that makefiles have been generated, simply run:
+    
+        make ycm_core
 
     For those who want to use the system version of libclang, you would pass
     `-DUSE_SYSTEM_LIBCLANG=ON` to cmake _instead of_ the
@@ -1244,7 +1250,7 @@ current file and simple prefix-based fitering.
 
 ### Why does YCM demand such a recent version of Vim?
 
-During YCM's development several show-stopper bugs where encountered in Vim.
+During YCM's development several show-stopper bugs were encountered in Vim.
 Those needed to be fixed upstream (and were). A few months after those bugs were
 fixed, Vim trunk landed the `pyeval()` function which improved YCM performance
 even more since less time was spent serializing and deserializing data between
@@ -1264,12 +1270,22 @@ You'll have to learn to ignore them. It's a shitty "solution", I know.
 Use the [delimitMate][] plugin instead. It does the same thing without
 conflicting with YCM.
 
+### Is there some sort of YCM mailing list? I have questions
+
+If you have questions about the plugin or need help, please use the
+[ycm-users][] mailing list, _don't_ create issues on the tracker. The tracker is
+for bug reports and feature requests.
 
 Contact
 -------
 
-If you have questions, bug reports, suggestions, etc. please use the [issue
-tracker][tracker]. The latest version is available at
+If you have questions about the plugin or need help, please use the
+[ycm-users][] mailing list.
+
+If you have bug reports or feature suggestions, please use the [issue
+tracker][tracker].
+
+The latest version of the plugin is available at
 <http://valloric.github.io/YouCompleteMe/>.
 
 The author's homepage is <http://val.markovic.io>.
@@ -1308,3 +1324,4 @@ This software is licensed under the [GPL v3 license][gpl].
 [exuberant-ctags]: http://ctags.sourceforge.net/
 [ctags-format]: http://ctags.sourceforge.net/FORMAT
 [vundle-bug]: https://github.com/gmarik/vundle/issues/48
+[ycm-users]: https://groups.google.com/forum/?hl=en#!forum/ycm-users
diff --git a/cpp/BoostParts/CMakeLists.txt b/cpp/BoostParts/CMakeLists.txt
index 14e37a4e..6b0d3675 100644
--- a/cpp/BoostParts/CMakeLists.txt
+++ b/cpp/BoostParts/CMakeLists.txt
@@ -118,3 +118,8 @@ if( MSVC )
     set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL" )
     set_target_properties( ${PROJECT_NAME} PROPERTIES STATIC_LIBRARY_FLAGS "/LTCG" )
 endif()
+
+if( SYSTEM_IS_SUNOS )
+  # SunOS needs this setting for thread support
+  set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthreads" )
+endif()
diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index 7afe590b..fecda10b 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -28,6 +28,10 @@ if ( ${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" )
   set( SYSTEM_IS_FREEBSD true )
 endif()
 
+if ( ${CMAKE_SYSTEM_NAME} MATCHES "SunOS" )
+  set( SYSTEM_IS_SUNOS true )
+endif()
+
 # Check if platform is 64 bit
 if( CMAKE_SIZEOF_VOID_P EQUAL 4 )
   set( 64_BIT_PLATFORM 0 )
diff --git a/cpp/ycm/CMakeLists.txt b/cpp/ycm/CMakeLists.txt
index 52e7afd6..44ea8717 100644
--- a/cpp/ycm/CMakeLists.txt
+++ b/cpp/ycm/CMakeLists.txt
@@ -313,4 +313,9 @@ endif()
 
 #############################################################################
 
+if( SYSTEM_IS_SUNOS )
+  # SunOS needs this setting for thread support
+  set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthreads" )
+endif()
+
 add_subdirectory( tests )
diff --git a/install.sh b/install.sh
index 7000fe2c..413b6608 100755
--- a/install.sh
+++ b/install.sh
@@ -102,20 +102,19 @@ function linux_cmake_install {
 }
 
 function usage {
-  echo "Usage: $0 [--clang-completer] [--cs-completer]"
+  echo "Usage: $0 [--clang-completer [--system-libclang]] [--omnisharp-completer]"
   exit 0
 }
 
-if [[ $# -gt 2 ]]; then
-  usage
-fi
-
-cmake_args=''
+cmake_args=""
 omnisharp_completer=false
 for flag in $@; do
   case "$flag" in
     --clang-completer)
-      cmake_args='-DUSE_CLANG_COMPLETER=ON'
+      cmake_args="-DUSE_CLANG_COMPLETER=ON"
+      ;;
+    --system-libclang)
+      cmake_args="$cmake_args -DUSE_SYSTEM_LIBCLANG=ON"
       ;;
     --omnisharp-completer)
       omnisharp_completer=true
@@ -126,6 +125,11 @@ for flag in $@; do
   esac
 done
 
+if [[ $cmake_args == *-DUSE_SYSTEM_LIBCLANG=ON* ]] && \
+   [[ $cmake_args != *-DUSE_CLANG_COMPLETER=ON* ]]; then
+  usage
+fi
+
 if ! command_exists cmake; then
   echo "CMake is required to build YouCompleteMe."
   cmake_install
diff --git a/plugin/youcompleteme.vim b/plugin/youcompleteme.vim
index 70c5e33d..c95a2284 100644
--- a/plugin/youcompleteme.vim
+++ b/plugin/youcompleteme.vim
@@ -21,13 +21,11 @@ set cpo&vim
 
 if exists( "g:loaded_youcompleteme" )
   finish
-elseif v:version < 704
-  if v:version < 703 || !has( 'patch584' )
-    echohl WarningMsg |
-          \ echomsg "YouCompleteMe unavailable: requires Vim 7.3.584+" |
-          \ echohl None
-    finish
-  endif
+elseif v:version < 703 || (v:version == 703 && !has('patch584'))
+  echohl WarningMsg |
+        \ echomsg "YouCompleteMe unavailable: requires Vim 7.3.584+" |
+        \ echohl None
+  finish
 elseif !has( 'python' )
   echohl WarningMsg |
         \ echomsg "YouCompleteMe unavailable: requires python 2.x" |
diff --git a/python/ycm/completers/general/filename_completer.py b/python/ycm/completers/general/filename_completer.py
index 42ad6711..8dd1f181 100644
--- a/python/ycm/completers/general/filename_completer.py
+++ b/python/ycm/completers/general/filename_completer.py
@@ -82,13 +82,13 @@ class FilenameCompleter( ThreadedCompleter ):
         # We do what GCC does for <> versus "":
         # http://gcc.gnu.org/onlinedocs/cpp/Include-Syntax.html
         include_current_file_dir = '<' not in include_match.group()
-        return GenerateCandidatesForPaths(
+        return _GenerateCandidatesForPaths(
           self.GetPathsIncludeCase( path_dir, include_current_file_dir ) )
 
     path_match = self._path_regex.search( line )
     path_dir = os.path.expanduser( path_match.group() ) if path_match else ''
 
-    return GenerateCandidatesForPaths( GetPathsStandardCase( path_dir ) )
+    return _GenerateCandidatesForPaths( _GetPathsStandardCase( path_dir ) )
 
 
   def GetPathsIncludeCase( self, path_dir, include_current_file_dir ):
@@ -110,7 +110,7 @@ class FilenameCompleter( ThreadedCompleter ):
     return sorted( set( paths ) )
 
 
-def GetPathsStandardCase( path_dir ):
+def _GetPathsStandardCase( path_dir ):
   if not USE_WORKING_DIR and not path_dir.startswith( '/' ):
     path_dir = os.path.join( os.path.dirname( vim.current.buffer.name ),
                              path_dir )
@@ -124,11 +124,19 @@ def GetPathsStandardCase( path_dir ):
            for relative_path in relative_paths )
 
 
-def GenerateCandidatesForPaths( absolute_paths ):
-  def GenerateCandidateForPath( absolute_path ):
-    is_dir = os.path.isdir( absolute_path )
-    return { 'word': os.path.basename( absolute_path ),
-              'dup': 1,
-              'menu': '[Dir]' if is_dir else '[File]' }
+def _GenerateCandidatesForPaths( absolute_paths ):
+  seen_basenames = set()
+  completion_dicts = []
 
-  return [ GenerateCandidateForPath( path ) for path in absolute_paths ]
+  for absolute_path in absolute_paths:
+    basename = os.path.basename( absolute_path )
+    if basename in seen_basenames:
+      continue
+    seen_basenames.add( basename )
+
+    is_dir = os.path.isdir( absolute_path )
+    completion_dicts.append( { 'word': basename,
+                               'dup': 1,
+                               'menu': '[Dir]' if is_dir else '[File]' } )
+
+  return completion_dicts