How do I tell Cmake where to find gfortran? - makefile

Question

I've tried to install DAMASK for study but faced many problems with it. There's nobody at university to help me with these problems, so I'm lookin' for help here.
For installing and working, DAMASK requires Cmake with gcc and gfortran and many programmer things like PETSc, scipy and numpy. I successfully installed all of that using homebrew, but cmake cause trouble. It doesn't seem to find gcc and gfortran at default.
With gcc I used
CC=/usr/bin/gcc
and it worked.
But it doesn't working with FC, 'cause
FC=/usr/bin/gfortran
not working
even
FC=/usr/local/cellar/gcc/10.2.0_4/bin/gfortran-10
not working
ah, I'm using Macos Catalina and the code of the whole errors there:
MacBook-Pro-Andrej:DAMASK admin1$ make spectral
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:4: /lib/petsc/conf/rules: No such file or directory
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:5: /lib/petsc/conf/variables: No such file or directory
make[1]: *** No rule to make target `/lib/petsc/conf/variables'. Stop.
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:4: /lib/petsc/conf/rules: No such file or directory
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:5: /lib/petsc/conf/variables: No such file or directory
make[1]: *** No rule to make target `/lib/petsc/conf/variables'. Stop.
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:4: /lib/petsc/conf/rules: No such file or directory
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:5: /lib/petsc/conf/variables: No such file or directory
make[1]: *** No rule to make target `/lib/petsc/conf/variables'. Stop.
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:4: /lib/petsc/conf/rules: No such file or directory
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:5: /lib/petsc/conf/variables: No such file or directory
make[1]: *** No rule to make target `/lib/petsc/conf/variables'. Stop.
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:4: /lib/petsc/conf/rules: No such file or directory
/var/folders/yb/bvc9yx0s2mx4yts18q2hfblw0000gp/T/tmp.XzJ43HLr/Makefile.petsc:5: /lib/petsc/conf/variables: No such file or directory
make[1]: *** No rule to make target `/lib/petsc/conf/variables'. Stop.
Found PETSC_DIR:
Found PETSC_INCLUDES:
Found PETSC_EXTERNAL_LIB:
Found PETSC_LINKER:
Found MPI Fortran Compiler:
Found MPI C Compiler:
-- The Fortran compiler identification is unknown
CMake Error at CMakeLists.txt:109 (project):
No CMAKE_Fortran_COMPILER could be found.
Tell CMake where to find the compiler by setting either the environment
variable "FC" or the CMake cache entry CMAKE_Fortran_COMPILER to the full
path to the compiler, or to the compiler name if it is in the PATH.
-- Configuring incomplete, errors occurred!
See also "/Users/admin1/DAMASK/CMakeFiles/CMakeOutput.log".
See also "/Users/admin1/DAMASK/CMakeFiles/CMakeError.log".
make: *** [build/spectral] Error 1
I don't know anything in UNIX programming but I was told to do it if I want to write my
thesis and my diploma...
So I'm lookin' for help here...