W10 + Cygwin-3.0.7 + Gfortran

[rih5342]

New user here.

My goal is to compile and use gcc-gfortran-8.3.0. 

I just made a fresh install of cygwin with the latest versions of GMP, MPFR,
and MPC.

After configuring gcc, config.log points out that GMP, MPFR, and MPC are not
there.

Q1) Why doesn't configure see the GMP that was installed by cygwin?

Q2) What's the difference between cygwin installing  GMP and my compiling
and installig GMP?

Thank you.



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