--DCMAKE_Fortran_COMPILE=/some/path/to/i686-linux-gnu-gfortran \
--DGFORTRAN_EXE=/some/path/to/i686-linux-gnu-gfortran
+-DCMAKE_Fortran_COMPILER=/some/path/to/i686-linux-gnu-gfortran \
+-DGFORTRAN_EXE=/some/path/to/i686-linux-gnu-gfortran \
+-DCMAKE_Fortran_FLAGS=-m32