Compile FAST v8.16.00a-bjj in double precision using GNU Fortran compiler

Dear all,

I have previously successfully compiled a 64-bit version of FAST v8.16.00a-bjj using the GNU Fortran compiler on my Linux system and it works well. From what I have gathered, FAST is compiled in single precision by default. Since I would like to use BeamDyn to model turbine blades, FAST need be compiled in double precision, according to page 46 of the README file provided with the FAST source code:

I tried to append -fdefault-real-8 to the FFLAGS compiler option in Compiling/makefile, and everything went well until an error occured:

Has anyone successfully compiled the latest version of FAST v8 in double precision using gfortran? Am I missing something important? Any help is appreciated.

Best regards,

Yuanchuan Liu