Haskell project fails on FreeBSD: Missing (or bad) C library: gfortran

[yurivict]

Configuring library for hmatrix-0.20.0.0.. cabal: Missing dependency on a foreign library: * Missing (or bad) C library: gfortran This problem can usually be solved by installing the system package that provides this library (you may need the "-dev" version). If the library is already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where it is.If the library file does exist, it may contain errors that are caught by the C compiler at the preprocessing stage. In this case you can re-run configure with the verbosity flag -v3 to see the error messages. 

libgfortran.so is in /usr/local/lib/gcc9.

--extra-lib-dirs= is a cabal install flag.

Is there any way to specify the library location like this at the level of individual projects in the context of the FreeBSD port?

[gbaz]

you can place these flags in cabal.project files.

[arrowd]

We already have a workaround. It is not clear why cabal new-configure doesn't take --extra-lib-dirs into account.

[bgamari]

For what it's worth, --extra-lib-dirs being ignored is tracked as #2997.

[gbaz]

resolving in favor of that