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# How to compile the examples?
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## PC/windows/codeblocks
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* Go to the [gmsh web page](http://gmsh.info/) and download the latest version of gmsh-SDK: Windows-32bits (Code::Blocks provides a 32bits compiler)
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* Unzip it somewhere e.g. `C:\local\gmsh-4.1.4-Windows32-sdk`
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* Optional: you can create a soft link to shorten this path with the commands Open a terminal with `cmd.exe`, then:
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```
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c:
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cd local
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mklink /J gmsh-sdk32 gmsh-4.1.4-Windows32-sdk
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```
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* It is also very convenient to move the gmsh dll from the `lib` folder to the `bin` folder:
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```
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move gmsh-sdk32\lib\gmsh-4.1.dll gmsh-sdk32\bin
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```
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* Overwrite `gmsh.h` with `gmsh.h_cwrap`:
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```
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copy /Y gmsh-sdk32\include\gmsh.h_cwrap gmsh-sdk32\include\gmsh.h
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```
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* Add the following environment variables to your windows session:
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```
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set GMSHSDK=C:\local\gmsh-sdk32
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set PATH=%GMSHSDK%\bin;%PATH%
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set INCLUDE=%GMSHSDK%\include;%INCLUDE%
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set LIB=%GMSHSDK%\lib;%LIB%
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set PYTHONPATH=%GMSHSDK%\lib;%PYTHONPATH%
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```
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In other words, you should add the `bin` folder of `gmsh-sdk32` to your `PATH` so that you can type `gmsh` in any terminal. The `bin` folder also contains the gmsh dynamic library, that must be found when `gmsh` (or your future solver) is run. The `INCLUDE` and `LIB` variables allows `CMake` to find the header `gmsh.h` and the library `gmsh.lib` respectively. Eventually, you may want to add the `lib` folder to your `PYTHONPATH` so that the command `import gmsh` works in python (it could be useful if you want to run python examples)
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* Download the latest version of CMake from the [CMake website](https://cmake.org/download/) and install it (add `cmake` to your `PATH` when asked, so that you can type `cmake` from a terminal)
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* Download [Code::Blocks](http://www.codeblocks.org/downloads). Choose the version with the mingw compiler included. Install it with the default options.
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* Add the MinGW compiler to your `PATH`
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* Clone this repository
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* ...
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## PC/Linux/gcc
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gmsh SDK requires libgfortran.so.3 to be installed on the system. On Ubuntu, you can install gfortran with the following line (admin rights required)
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```
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sudo apt-get install libgfortran3
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```
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If you want to build the examples on NIC4, you must load a gcc module. I recommend the following one which is compatible with many other libraries of the system.
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```
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module load gcc/4.9.2
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```
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The following variables should also be defined so that CMake finds the correct gcc. Put these lines in your `~/.bashrc` file:
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```
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export CC=gcc
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export CXX=g++
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export FC=gfortran
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```
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## macOS/clang
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