gem-config: add curses (#45068)

Changed files
+4
pkgs
development
ruby-modules
gem-config
+4
pkgs/development/ruby-modules/gem-config/default.nix
···
buildInputs = [ curl ];
};
+
curses = attrs: {
+
buildInputs = [ ncurses ];
+
};
+
dep-selector-libgecode = attrs: {
USE_SYSTEM_GECODE = true;
postInstall = ''