diff --git a/.ycm_extra_conf.py b/.ycm_extra_conf.py
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+# This file is NOT licensed under the GPLv3, which is the license for the rest
+# of YouCompleteMe.
+#
+# Here's the license text for this file:
+#
+# This is free and unencumbered software released into the public domain.
+#
+# Anyone is free to copy, modify, publish, use, compile, sell, or
+# distribute this software, either in source code form or as a compiled
+# binary, for any purpose, commercial or non-commercial, and by any
+# means.
+#
+# In jurisdictions that recognize copyright laws, the author or authors
+# of this software dedicate any and all copyright interest in the
+# software to the public domain. We make this dedication for the benefit
+# of the public at large and to the detriment of our heirs and
+# successors. We intend this dedication to be an overt act of
+# relinquishment in perpetuity of all present and future rights to this
+# software under copyright law.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+#
+# For more information, please refer to <http://unlicense.org/>
+
+import os
+import ycm_core
+from clang_helpers import PrepareClangFlags
+
+# Set this to the absolute path to the folder (NOT the file!) containing the
+# compile_commands.json file to use that instead of 'flags'. See here for
+# more details: http://clang.llvm.org/docs/JSONCompilationDatabase.html
+# Most projects will NOT need to set this to anything; you can just change the
+# 'flags' list of compilation flags. Notice that YCM itself uses that approach.
+compilation_database_folder = ''
+
+# These are the compilation flags that will be used in case there's no
+# compilation database set.
+flags = [
+# THIS IS IMPORTANT! Without a "-std=<something>" flag, clang won't know which
+# language to use when compiling headers. So it will guess. Badly. So C++
+# headers will be compiled as C headers. You don't want that so ALWAYS specify
+# a "-std=<something>".
+# For a C project, you would set this to something like 'c99' instead of
+# 'c++11'.
+'-std=c++11',
+# ...and the same thing goes for the magic -x option which specifies the
+# language that the files to be compiled are written in. This is mostly
+# relevant for c++ headers.
+# For a C project, you would set this to 'c' instead of 'c++'.
+'-x',
+'c++',
+'-DQT_CORE_LIB',
+'-DQT_GUI_LIB',
+'-DQT_NETWORK_LIB',
+'-DQT_QML_LIB',
+'-DQT_QUICK_LIB',
+'-DQT_SQL_LIB',
+'-DQT_WIDGETS_LIB',
+'-DQT_XML_LIB',
+
+'-I', '/usr/lib/qt/mkspecs/linux-clang',
+'-I', '/usr/include/qt',
+'-I', '/usr/include/qt/QtConcurrent',
+'-I', '/usr/include/qt/QtCore',
+'-I', '/usr/include/qt/QtDBus',
+'-I', '/usr/include/qt/QtGui',
+'-I', '/usr/include/qt/QtHelp',
+'-I', '/usr/include/qt/QtMultimedia',
+'-I', '/usr/include/qt/QtMultimediaWidgets',
+'-I', '/usr/include/qt/QtNetwork',
+'-I', '/usr/include/qt/QtOpenGL',
+'-I', '/usr/include/qt/QtPlatformSupport',
+'-I', '/usr/include/qt/QtPositioning',
+'-I', '/usr/include/qt/QtScript',
+'-I', '/usr/include/qt/QtScriptTools',
+'-I', '/usr/include/qt/QtSql',
+'-I', '/usr/include/qt/QtSvg',
+'-I', '/usr/include/qt/QtTest',
+'-I', '/usr/include/qt/QtUiTools',
+'-I', '/usr/include/qt/QtV8',
+'-I', '/usr/include/qt/QtWebKit',
+'-I', '/usr/include/qt/QtWebKitWidgets',
+'-I', '/usr/include/qt/QtWidgets',
+'-I', '/usr/include/qt/QtXml',
+'-I', '/usr/include/qt/QtXmlPatterns',
+
+'-I', '.',
+'-I', 'Tests',
+'-I', 'build',
+'-I', 'build/Tests'
+]
+
+if compilation_database_folder:
+  database = ycm_core.CompilationDatabase( compilation_database_folder )
+else:
+  database = None
+
+
+def DirectoryOfThisScript():
+  return os.path.dirname( os.path.abspath( __file__ ) )
+
+
+def MakeRelativePathsInFlagsAbsolute( flags, working_directory ):
+  if not working_directory:
+    return flags
+  new_flags = []
+  make_next_absolute = False
+  path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
+  for flag in flags:
+    new_flag = flag
+
+    if make_next_absolute:
+      make_next_absolute = False
+      if not flag.startswith( '/' ):
+        new_flag = os.path.join( working_directory, flag )
+
+    for path_flag in path_flags:
+      if flag == path_flag:
+        make_next_absolute = True
+        break
+
+      if flag.startswith( path_flag ):
+        path = flag[ len( path_flag ): ]
+        new_flag = path_flag + os.path.join( working_directory, path )
+        break
+
+    if new_flag:
+      new_flags.append( new_flag )
+  return new_flags
+
+
+def FlagsForFile( filename ):
+  if database:
+    # Bear in mind that compilation_info.compiler_flags_ does NOT return a
+    # python list, but a "list-like" StringVec object
+    compilation_info = database.GetCompilationInfoForFile( filename )
+    final_flags = PrepareClangFlags(
+        MakeRelativePathsInFlagsAbsolute(
+            compilation_info.compiler_flags_,
+            compilation_info.compiler_working_dir_ ),
+        filename )
+  else:
+    relative_to = DirectoryOfThisScript()
+    final_flags = MakeRelativePathsInFlagsAbsolute( flags, relative_to )
+
+  return {
+    'flags': final_flags,
+    'do_cache': True
+  }