[R-SIG-Mac] Lost Library ?

[Roger Koenker]

Thanks Simon, your last suggestion resolves the issue nicely for the moment, I am pursuing
it with the gurobi folks,  I thought that this was a reputable outfit, but I’m beginning to have 
doubts.

Roger

url:    www.econ.uiuc.edu/~roger            Roger Koenker
email    rkoenker at uiuc.edu            Department of Economics
vox:     217-333-4558                University of Illinois
fax:       217-244-6678                Urbana, IL 61801

> On Sep 7, 2016, at 10:16 AM, Simon Urbanek <simon.urbanek at r-project.org> wrote:
> 
>> 
>> On Sep 6, 2016, at 5:34 PM, Roger Koenker <rkoenker at illinois.edu> wrote:
>> 
>> This is a question about how to find a lost library needed for the gurobi R package.
>> Gurobi is a optimization system with various frontends including to R.
>> Even though I realize that few of you use, or may even know about, gurobi I hope
>> that there may be  some generic advice — my first  dubious attempts, contrary to Simon’s
>> periodic advice that use of DYLD_LIBRARY_PATH is frowned upon,  have proven futile.
>> Here is the basic story:
>> 
>> I've installed gurobi and its license file and this seems to work on a test problem from the command line,
>> but I would like to use the R package interface and have installed the R binary package that comes with
>> the gurobi download on a R 3.3.0 system on an osx 10.11.5 machine,   As far as I can see there is no
>> source version of the R package available.   The package “seems to” install, but I now see in R:
>> 
>>> library(gurobi)
>> Loading required package: gurobi
>> Loading required package: slam
>> Error in dyn.load(file, DLLpath = DLLpath, ...) : 
>> unable to load shared object '/Library/Frameworks/R.framework/Versions/3.3/Resources/library/gurobi/libs/gurobi.so':
>> dlopen(/Library/Frameworks/R.framework/Versions/3.3/Resources/library/gurobi/libs/gurobi.so, 6): Library not loaded: libgurobi65.so
>> Referenced from: /Library/Frameworks/R.framework/Versions/3.3/Resources/library/gurobi/libs/gurobi.so
>> Reason: image not found
>> 
>> the library libgurobi65.so is sitting in /usr/local/lib so I don't understand why the
>> R process can't find it
> 
> 
> Possibly because gurobi authors have no idea about OS X? The library should include its location in its ID field and also .so is not the correct extension for a OS X library - it's not Linux :). So if you still have some trust in that product, you can try 
> 
> sudo install_name_tool -id /usr/local/lib/libgurobi65.so /usr/local/lib/libgurobi65.so
> 
> and the re-compile the R package and cross your fingers that it will work. Alternatively, if you can't compile it yourself, you can manually force the correct path in the package via
> 
> install_name_tool -change libgurobi65.so /usr/local/lib/libgurobi65.so /Library/Frameworks/R.framework/Versions/3.3/Resources/library/gurobi/libs/gurobi.so
> 
> but as other said, you should really ask them to fix their product ;).
> 
> Cheers,
> Simon
> 
> 
>> -- this is what the R package library thinks:
>> 
>> yzzy: otool -L g*
>> 
>> gurobi.so:
>> 	gurobi.so (compatibility version 0.0.0, current version 0.0.0)
>> 	libgurobi65.so (compatibility version 6.5.0, current version 6.5.2)
>> 	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1197.1.1)
>> 	/Library/Frameworks/R.framework/Versions/3.2/Resources/lib/libR.dylib (compatibility version 3.2.0, current version 3.2.2)
>> 	/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 855.17.0)
>> 
>> Many thanks for your help,
>> Roger
>> 
>> url:    www.econ.uiuc.edu/~roger            Roger Koenker
>> email    rkoenker at uiuc.edu            Department of Economics
>> vox:     217-333-4558                University of Illinois
>> fax:       217-244-6678                Urbana, IL 61801
>> 
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