# Use of MINLP in Julia

**URL:** https://discourse.julialang.org/t/use-of-minlp-in-julia/22161
**Category:** Optimization (Mathematical)
**Created:** [March 21, 2019, 7:43pm UTC](https://discourse.julialang.org/t/use-of-minlp-in-julia/22161 "2019-03-21T19:43:37Z")
**Posts on this page:** 1
**Showing post:** 10

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### Author: ![tkoolen](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tkoolen/32/1603_2.png) [@tkoolen](https://discourse.julialang.org/u/tkoolen)
#### Post date: [March 22, 2019, 1:44pm UTC](https://discourse.julialang.org/t/use-of-minlp-in-julia/22161/10 "2019-03-22T13:44:25Z")

</div>

If I recall correctly, the `.deb` file didn’t work for me because the latest released version of SCIP required a version of Ipopt that’s newer than what’s available through `apt` on Ubuntu 18.04, so installation failed. I don’t remember if I tried tarbalIs, but at that point I decided to build both SCIP and the latest version of Ipopt from source, also because I wanted to have SCIP use CPLEX.

Building Ipopt then required HSL from [HSL for IPOPT](http://www.hsl.rl.ac.uk/ipopt/) (or at least that’s what my labmate told me is the fastest linear solver package). I needed to add its `lib` directory to `LD_LIBRARY_PATH` and also needed to symlink (or rename) `libcoinhsl.so` to `libhsl.so`, as that’s what Ipopt is looking for (must have been renamed at some point).

Then, for SCIP itself, I needed to edit one of their CMake files, as I was getting linking errors when using their CMake build with CPLEX. In `gcg/cmake/Modules/FindCPLEX.cmake`, I added `dl` and `util` to `CPLEX_LIBRARIES`.

After that, I built using

```bash
mkdir install
mkdir build
cd build
CC=clang-7 CXX=clang++-7 cmake -D CMAKE_BUILD_TYPE=Release -D BUILD_TESTING=OFF -D IPOPT_DIR=/home/twan/code/ipopt/Ipopt-3.12.12 -D CPLEX=ON -D CPLEX_DIR=/opt/ibm/ILOG/CPLEX_Studio128/cplex -D CMAKE_INSTALL_PREFIX=../install ..
make -j 20
make install

```

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