The Glk API has many implementations, and in C land it's common to manually specify which library you want to link against (usually by directly specifying the path and lib name, not using a system library). For example Glulxe's Makefile contains

GLKINCLUDEDIR = ../cheapglk
GLKLIBDIR = ../cheapglk
GLKMAKEFILE = Make.cheapglk

#GLKINCLUDEDIR = ../glkterm
#GLKLIBDIR = ../glkterm
#GLKMAKEFILE = Make.glkterm

#GLKINCLUDEDIR = ../xglk
#GLKLIBDIR = ../xglk
#GLKMAKEFILE = Make.xglk

#GLKINCLUDEDIR = ../remglk
#GLKLIBDIR = ../remglk
#GLKMAKEFILE = Make.remglk

What would be a natural Rustic way of allowing for the same?

Is this a case where a build.rs file would be the best option? I guess it could even do exactly like that Makefile and simply have a bunch of options all but one commented out. Or could there be a way to pass an option to the build.rs to tell it which one to choose?

Does anyone know of a Rust project which does something like this which I could consult?

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