CC and CXX are set in Sage to default values if they are not specified.
The readme says:
---------------------------------------------
NOTE: If you're using Fortran on a platform without g95 binaries included
with Sage, e.g., Itanium, you must use a system-wide gfortran. You
have to explicitly tell the build process about the fortran
compiler and library location. Do this by typing
export SAGE_FORTRAN=/exact/path/to/gfortran
export SAGE_FORTRAN_LIB=/path/to/fortran/libs/libgfortran.so
-------------------------------------------------
Is there supposed to be any way to specify Fortran flags? Why is a
default of gfortran not used, like it is with gcc and g++ ? Does anyone
know why the location of the library needs to be given? One does not
need to do it with C or C++.
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