Installing on M1 mac required GNU fortran compiler (install solution) [ld: warning: directory not found for option '-L/opt/R/arm64/gfortran/lib/gcc/aarch64-apple-darwin20.6.0/12.0.1' ]

[FerrenaAlexander]

Hi, just wanted to report an install issue and the fix for it, that I experienced while installing lastest version on M1 (arm64) mac.

The error:

ld: warning: directory not found for option '-L/opt/R/arm64/gfortran/lib/gcc/aarch64-apple-darwin20.6.0/12.0.1' 
ld: library not found for -lemutls_w clang: error: linker command failed with exit code 1 (use -v to see invocation) 
make: *** [RISC.so] Error 1

The fix, install GNU Fortran compiler:
See https://mac.r-project.org/tools/
Or, see drieslab/Giotto#441

# for R>=4.2.0
curl -O https://mac.r-project.org/tools/gfortran-12.0.1-20220312-is-darwin20-arm64.tar.xz

# unpack
sudo tar fxz gfortran-12.0.1-20220312-is-darwin20-arm64.tar.xz -C /

#add to path
export PATH=$PATH:/opt/R/arm64/gfortran/bin

# /opt/R/arm64/gfortran/SDK has to point to your macOS SDK
sudo gfortran-update-sdk

Then I restarted R and the install worked. Hope this helps if people run into this issue.

[cmiciano]

thank you for posting this, much appreciated