The Free Linguistic Environment (FLE)

(C) 2016-2017 by Damir Cavar

The Free Linguistic Environment (FLE) is a project to develop a grammar engineering platform for the Lexical Functional Grammar (LFG) framework. The parser in FLE is geared towards parsing natural language sentences using grammars written in the LFG. It is mainly developed using C++11 or newer C++ language specifications.

Build and Install

In the requirements.md file you might find more details about software and library requirements.

This is a brief overview of the components that are needed to develop FLE:

If you do not want to use CLion or a similar environment, and if you are using G++/GCC, in the source folder compile using the following commands:

mkdir build
cd build
cmake ../.


Grammar Backbone


Copyright 2015-2017 by Damir Cavar with contribution by Lwin Moe, Hai Hu, ...

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.