[R-SIG-Mac] gfortran and macos 27

[Erich Neuwirth]

The problem seems to be buried in clang.

I reinstalled gfortran 
and ran the following test (recommended by perplexity)

 ~ /opt/gfortran/bin/gfortran --version

cat > /tmp/check.f <<'EOF'
      program check
      print *, 'OK'
      end
EOF

/opt/gfortran/bin/gfortran -arch arm64 \
  /tmp/check.f -o /tmp/check

/tmp/check

GNU Fortran (GCC) 14.2.0
Copyright (C) 2024 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.

clang: error: invalid version number in '-mmacosx-version-min=18.0'
zsh: no such file or directory: /tmp/check








> On Oct 3, 2026, at 12:38 PM, Erich Neuwirth <erich.neuwirth using univie.ac.at> wrote:
> 
> Hi Peter,
> I sett FFLAGS in .Renviron
>> Sys.getenv("FFLAGS")
> [1] "-mmacosx-version-min=26.0”
> 
> but when compiling still get the error
> clang: error: invalid version number in '-mmacosx-version-min=18.0'
> make: *** [qapsim.o] Error 1
> ERROR: compilation failed for package ‘qap’
> 
> 
> 
>> On Oct 2, 2026, at 1:43 PM, Peter Dalgaard <pdalgd using gmail.com> wrote:
>> 
>> FFLAGS=-mmacosx-version-min=26.0
> 
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