I am currently @ Stockholm Resilience Center, Stockholm University, Kräftriket 2B, SE-10691 Stockholm, Sweden

# Further problems with dynamic links for R-Grass GIS 7 users in Mac OSX

I published a post the day before yesterday on workarounds for R-Grass GIS 7 (co-interface) users in Mac OSX, particularly for the ones updated to El Capitan. The major issues for GRASS users in EL Capitan are related to the dynamic links (dyld), for which I offered the solution of including the possible python library paths in the system environment as DYLD_LIBRARY_PATH. Although this solved the problem of initiating GRASS from R interface, the issue of dyld paths persists while calling the 'v.extract' module. Initially, the error appeared to be like the following:

which may tell you that it is related to not finding a python library. However, the actual error can be found by setting legacyExec argument to TRUE in the parseGRASScommand.

This is in fact a dyld problem but related to a library provided by FFTW framework. The FFTW framework is not a requirement for GRASS 7 and also not available (the newer versions) for download in the GRASS page. It comes with the GRASS installation package but R cannot establish a symlink to the directory containing the library, i.e. /Applications/GRASS-7.3.app/Contents/MacOS/lib/FFTW3.framework/Versions/3, although it was added in the DYLD_LIBRARY_PATH. It can also be downloaded from the FFTW official page but the library provided is not identified by GRASS as an architecture matching universal wrapper. The workaround I suggest (found out after struggling for a day) is to simply copy the FFTW framework provided by GRASS from the GRASS directory to the framework directory.

This will solve the problem!

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