octave 6.1.0 on mac os 11.0.1

[sunilshah]

I upgraded octave 5.2.0_10 to octave 6.1.0. I am on macos 11.0.1 on an Intel MBP 2017. Octave 5.2.0_10 worked fine including installing the packages from source forge.

I am having issues with the installed octave packages. In particular, the pkg command (which uses script mkoctfile) fails in the link step

octave:1>pkg install -forge  control

...
ld: warning: directory not found for option '-L/usr/local/opt/gcc/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0'
ld: warning: directory not found for option '-L/usr/local/opt/gcc/lib/gcc/10/gcc/x86_64-apple-darwin20/10.2.0/../../..'
ld: library not found for -lgfortran
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [__control_slicot_functions__.oct] Error 1

I have recall that this issue has been around with Catalina, though I could not find it in searches so far.

I would appreciate any input on how to proceed to get a resolution. If appropriate I can file an issue.

[sunilshah]

Resolved by:

$ brew reinstall gcc

It recreated the missing gcc/lib directories for x86_64-apple-darwin20 (aka Big Sur)