Error during packages compilation about -lomp


If you have an error about -lomp, you must verify that you have libomp.dylib. The simplest way to do is to in terminal and activate locate database:

sudo /usr/libexec/locate.updatedb

This function can be used also to update the database.

Then you can do:

locate libomp.dylib  | xargs ls -l

And the result is for example:
-rwxrwxr-x  1 root          admin  508044 26 aoû 22:31 /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libomp.dylib
-r--r--r--  1 marcgirondot  admin  442396 31 jan  2018 /usr/local/Cellar/llvm/5.0.1/lib/libomp.dylib
-r--r--r--  1 marcgirondot  admin  491820 12 mar 09:38 /usr/local/Cellar/llvm/6.0.0/lib/libomp.dylib
-r--r--r--  1 marcgirondot  admin  495888  6 jul 17:11 /usr/local/Cellar/llvm/6.0.1/lib/libomp.dylib

Choose the one that you want (here the first one because it is the most recent), and do:

sudo ln -s /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libomp.dylib /usr/local/lib/libomp.dylib

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