### Estou tentando instalar um programa que requer que o gfortran construa
O pacote mais recente do Cygwin Fortran é gcc-fortran-7.3.0-3 .
gcc-fortran: GNU Compiler Collection (Fortran)
2018-06-26 17:34 0 usr/bin/f95 -> gfortran.exe 2018-06-26 17:43 934931 usr/bin/gfortran.exe 2018-06-26 17:43 0 usr/bin/x86_64-pc-cygwin-gfortran.exe -> usr/bin/gfortran.exe 2018-06-26 17:34 0 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/ 2018-06-26 17:31 9702 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/ieee_arithmetic.mod 2018-06-26 17:31 2208 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/ieee_exceptions.mod 2018-06-26 17:31 1251 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/ieee_features.mod 2018-06-26 17:34 15411 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/omp_lib.f90 2018-06-26 17:34 5335 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/omp_lib.h 2018-06-26 17:34 2981 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/omp_lib.mod 2018-06-26 17:34 610 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/omp_lib_kinds.mod 2018-06-26 17:34 28053 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/openacc.f90 2018-06-26 17:34 3466 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/openacc.mod 2018-06-26 17:34 484 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/openacc_kinds.mod 2018-06-26 17:34 12388 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/finclude/openacc_lib.h 2018-06-26 18:58 20222483 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/f951.exe 2018-06-26 17:31 210238 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/libcaf_single.a 2018-06-26 17:31 13307770 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/libgfortran.a 2018-06-26 17:31 1050584 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/libgfortran.dll.a 2018-06-26 17:31 269 usr/lib/gcc/x86_64-pc-cygwin/7.3.0/libgfortran.spec 2018-06-26 17:28 187195 usr/share/info/gfortran.info.gz 2018-06-26 17:28 22196 usr/share/man/man1/gfortran.1.gz
Fonte link
Este pacote pode ser instalado usando o programa de instalação do Cygwin .