# Question about NLopt
**URL:** https://discourse.julialang.org/t/question-about-nlopt/2013
**Category:** General Usage
**Tags:** question, package
**Created:** [February 9, 2017, 11:53pm UTC](https://discourse.julialang.org/t/question-about-nlopt/2013 "2017-02-09T23:53:58Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@arinbasu](https://discourse.julialang.org/u/arinbasu)
#### Post date: [February 9, 2017, 11:53pm UTC](https://discourse.julialang.org/t/question-about-nlopt/2013/1 "2017-02-09T23:53:58Z")
Hi All,
(A friend asks):
I have a task that I think the MixedModels package may be better able to handle than lme4 in R.
I did a clean Julia install before proceeding to install MixedModels. Unfortunately the current version of NLopt seems broken.
```julia
julia> using NLopt
INFO: Precompiling module NLopt.
ERROR: LoadError: NLopt not properly installed. Please run Pkg.build("NLopt")
Pkg.build("NLopt") returns
====================================[ERROR: NLopt]=====================================
LoadError: SystemError: unable to read directory /Users/johnm1/.julia/v0.5/Homebrew/deps/usr/Library/Taps/staticfloat/homebrew-juliatranslated: No such file or directory
while loading /Users/johnm1/.julia/v0.5/NLopt/deps/build.jl, in expression starting on line 54
=========================================================================================
The web page http://pkg.julialang.org/detail/NLopt.html says:
Julia v0.5
2016-12-09 to 2017-02-07, v0.3.3, Tests fail.
2016-08-27 to 2016-12-06, v0.3.3, Tests pass.
2016-05-24 to 2016-08-26, v0.3.2, Tests pass.
. . .
```
I did try using Pkg.pin(“NLopt”,v"0.3.2") to downgrade to an earlier version, but still NLopt would not load.
Can you kindly provide guidance on where to go next.
Kind Regards,
Arindam Basu
---
### Author:  [@tkelman](https://discourse.julialang.org/u/tkelman)
#### Post date: [February 10, 2017, 9:18am UTC](https://discourse.julialang.org/t/question-about-nlopt/2013/2 "2017-02-10T09:18:52Z")
It looks like you should open an issue at Homebrew.jl.
---
### Author:  [@malmaud](https://discourse.julialang.org/u/malmaud)
#### Post date: [February 10, 2017, 3:14pm UTC](https://discourse.julialang.org/t/question-about-nlopt/2013/3 "2017-02-10T15:14:25Z")
You can try removing and then re-adding Homebrew:
```julia
Pkg.rm("Homebrew")
Pkg.add("Homebrew")
Pkg.build("NLopt")
```
---
### Author:  [@arinbasu](https://discourse.julialang.org/u/arinbasu)
#### Post date: [February 10, 2017, 7:42pm UTC](https://discourse.julialang.org/t/question-about-nlopt/2013/4 "2017-02-10T19:42:38Z")
Thanks a million, will give it a shot today.
Best,
Arin
---
### Author:  [@jhmaindonald](https://discourse.julialang.org/u/jhmaindonald)
#### Post date: [February 10, 2017, 10:25pm UTC](https://discourse.julialang.org/t/question-about-nlopt/2013/5 "2017-02-10T22:25:44Z")
The query that Arin passed on was from me. After running the first two
commands, `Pkg.build("NLopt")` generated the same errors as before.
Why would the issue arise for NLopt, but not for other packages required
by MixedModels, if it was a Homebrew issue? Thus, Rmath builds without
problem?
---
### Author:  [@addhyan](https://discourse.julialang.org/u/addhyan)
#### Post date: [March 7, 2017, 5:20pm UTC](https://discourse.julialang.org/t/question-about-nlopt/2013/6 "2017-03-07T17:20:10Z")
Sorry if I use R-terminology in this thread, I’m new to Julia. I am using MixedModels for the same reason as Arin. I am having similar issues with installing “NLopt”. After an initial warning “Warning: staticfloat/juliatranslated/nlopt-2.4.2\_2 already installed, it’s just not linked.” I’ve been getting following errors: “while loading /Users/adpandey/.julia/v0.5/NLopt/deps/build.jl, in expression starting on line 54”.
The exact issue seems to be the following:
Formulae found in multiple taps:
- homebrew/science/nlopt
- staticfloat/juliatranslated/nlopt
Clearly it can find nlopt at multiple locations and is not sure where to use it from.
Any help will be highly appreciated.
---
### Author:  [@addhyan](https://discourse.julialang.org/u/addhyan)
#### Post date: [March 8, 2017, 3:52am UTC](https://discourse.julialang.org/t/question-about-nlopt/2013/7 "2017-03-08T03:52:31Z")
Found a solution: [https://github.com/Homebrew/homebrew-science](https://github.com/Homebrew/homebrew-science)
brew tap homebrew/science
brew install nlopt
Rebuild NLopt in julia