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This modification was made because the project was not compiling with Ubununtu 17 and g++ 7.2
this version should be backward compatible (I have tried also on Ubuntu 14.04.5 LTS with g++ 5.4.1)
it was based on "*NIX compatibility by HippoBaro" pull request
on the GridGraph repository,
The modifications were to silence couple of warnings that are treated as errors in couple of files and preventing the project from compiling
to clone this pull request:
git clone https://github.com/thu-pacman/GridGraph.git
cd GridGraph
git fetch origin pull/7/head
git checkout -b pullrequest FETCH_HEAD
to compile
mkdir build
cd build
cmake ..
make