Yes, the old gfortran ~4.8.6 binary can cause this issue. Unfortunately, there isn't an uninstaller. I wrote up some guidelines for removing it here:
https://thecoatlessprofessor.com/programming/cpp/removing-the-old-r-custom-gfortran-4.8.2-binary/ The gist is: # Download installer into working directory curl -O http://r.research.att.com/libs/gfortran-4.8.2-darwin13.tar.bz2 # Remove _files_ associated with the binary for file in $(tar tfz gfortran-4.8.2-darwin13.tar.bz2); do sudo rm -f /$file; done # Remove empty _folders_ associated with the binary for folder in $(tar tfz gfortran-4.8.2-darwin13.tar.bz2); do sudo rmdir -p /$folder; done # Delete the installer rm -rf gfortran-4.8.2-darwin13.tar.bz2 Best, JJB On 8/4/20, 11:25 AM, "R-SIG-Mac on behalf of Duncan Murdoch" <r-sig-mac-boun...@r-project.org on behalf of murdoch.dun...@gmail.com> wrote: I found the problem. /usr/local/lib had old copies of libgfortran* and libquadmath* from 2015, and removing these allowed things to proceed. The current copies are in /usr/local/gfortran/lib. That directory contains a lot of old junk; I'll probably find more needs to go too. Duncan Murdoch On 04/08/2020 9:58 a.m., Duncan Murdoch wrote: > After updating to Catalina, I've installed the Xcode command line tools > version 11.4.1, and gfortran 8.2. When trying to build R, configure dies: > > checking whether gfortran appends underscores to external names... yes > checking whether gfortran appends extra underscores to external > names... no > checking whether mixed C/Fortran code can be run... configure: > WARNING: cannot run mixed C/Fortran code > configure: error: Maybe check LDFLAGS for paths to Fortran libraries? > > I don't have LDFLAGS set. I'm not certain I'm running the right > compilers (I might have old ones that have precedence on the path). Are > these the versions I should be seeing? > > $ clang --version > Apple clang version 11.0.3 (clang-1103.0.32.59) > Target: x86_64-apple-darwin19.6.0 > Thread model: posix > InstalledDir: /Library/Developer/CommandLineTools/usr/bin > > $ gfortran --version > GNU Fortran (GCC) 8.2.0 > Copyright (C) 2018 Free Software Foundation, Inc. > This is free software; see the source for copying conditions. There is NO > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > > If those are the right versions, any other suggestions on how to fix the > configure problem? > > Duncan Murdoch > _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac
