[R] Error when loading optimx package and a solution

[J C Nash]

Hi,

That looks like the dependency on nlopt for nloptr (used by several of the
solvers) was somehow missing. There is SUPPOSED to be a check of what is installed
and a warning issued, but possibly one got missed. Even some base packages
do sometimes need the external libraries manually installed, and I find I'm
doing that after various OS updates or resets when the long term support
runs out.

Some updates and minor extensions to optimx, mostly convenience features or
checks that dependencies available, are on the github version, which is a bit
ahead of CRAN (https://github.com/nashjc/optimx). I find doing all the checks
and revdeps for the package now getting heavy enough that it is worth waiting
a bit unless there's a critical bug, which I don't think there has been for
a long while.

I don't have a Mac, and am currently away from home (actually in Nice, FR for
a couple of weeks), but would be interested in knowing if the github version
needs an independent install of nlopt on Mac, or indeed on any platform.

Cheers,

John Nash
maintainer, optimx


On 2025-02-05 04:46, Marc Girondot via R-help wrote:
> Dear R-help members
> 
> Since this morning (5/2/2025), I get an error when I try to load optimx package. I solve it and I send my solution but 
> if someone has a better idea or understand what's happened, I will be most happy to know.
> 
> MacOSX 15.3
> 
> R 4.4.2
> 
> nlopt installed using
> brew install nlopt
> 
> Here are the steps to produce the error and a solution to solve it. Some parts are in French. I don't know how to "ask" 
> to R to not use French for some system messages.
> 
> Marc
> 
> 
>  > library("optimx")
> Erreur : le chargement du package ou de l'espace de noms a échoué pour ‘optimx’ in dyn.load(file, DLLpath = DLLpath, ...) :
> impossible de charger l'objet partagé '/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library/nloptr/libs/ 
> nloptr.so' :
> dlopen(/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library/nloptr/libs/nloptr.so, 0x0006): Library not 
> loaded: /opt/homebrew/opt/nlopt/lib/libnlopt.0.dylib
>    Referenced from: <2A7DAFE2-8123-3555-9569-F28214328E47> /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/ 
> library/nloptr/libs/nloptr.so
>    Reason: tried: '/opt/homebrew/opt/nlopt/lib/libnlopt.0.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/ 
> opt/homebrew/opt/nlopt/lib/libnlopt.0.dylib' (no such file), '/opt/homebrew/opt/nlopt/lib/libnlopt.0.dylib' (no such 
> file), '/Library/Frameworks/R.framework/Resources/lib/libnlopt.0.dylib' (no such file), '/Library/Java/ 
> JavaVirtualMachines/jdk-11.0.18+10/Contents/Home/lib/server/libnlopt.0.d
> It seems that the file libnlopt.0.dylib is not find.
> 
> When I check in this folder, indeed it is not present:
> 
> √ lib % cd /opt/homebrew/opt/nlopt/lib
> √ lib % ls
> cmake            libnlopt.1.dylib    pkgconfig
> libnlopt.1.0.0.dylib    libnlopt.dylib
> 
> I create a symlink:
> 
> √ lib % sudo ln -s libnlopt.1.dylib libnlopt.0.dylib
> Password:
> √ lib % ls -al
> total 880
> drwxr-xr-x   8 marcgirondot  admin     256  5 fév 10:28 .
> drwxr-xr-x  15 marcgirondot  admin     480  5 fév 10:26 ..
> drwxr-xr-x   3 marcgirondot  admin      96  4 fév 19:29 cmake
> lrwxr-xr-x   1 root          admin      16  5 fév 10:28 libnlopt.0.dylib -> libnlopt.1.dylib
> -r--r--r--   1 marcgirondot  admin  447936  5 fév 10:26 libnlopt.1.0.0.dylib
> lrwxr-xr-x   1 marcgirondot  admin      20  4 fév 19:29 libnlopt.1.dylib -> libnlopt.1.0.0.dylib
> lrwxr-xr-x   1 marcgirondot  admin      16  4 fév 19:29 libnlopt.dylib -> libnlopt.1.dylib
> drwxr-xr-x   3 marcgirondot  admin      96  5 fév 10:26 pkgconfig
> 
> and I reinstall optimx from source
> 
>  > remove.packages("optimx")
> Elimination du package de ‘/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library’
> (car ‘lib’ n'est pas spécifié)
>  > install.packages("optimx", type="source")
> essai de l'URL 'https://cran.irsn.fr/src/contrib/optimx_2024-12.2.tar.gz'
> Content type 'application/x-gzip' length 2259525 bytes (2.2 MB)
> ==================================================
> downloaded 2.2 MB
> 
> * installing *source* package ‘optimx’ ...
> ** package ‘optimx’ correctement décompressé et sommes MD5 vérifiées
> ** using staged installation
> ** R
> ** inst
> ** byte-compile and prepare package for lazy loading
> ** help
> *** installing help indices
> ** building package indices
> ** installing vignettes
> ** testing if installed package can be loaded from temporary location
> ** testing if installed package can be loaded from final location
> ** testing if installed package keeps a record of temporary installation path
> * DONE (optimx)
> 
> Les packages source téléchargés sont dans
>      ‘/private/tmp/Rtmpsb2lpE/downloaded_packages’
> 
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