I have moved from Fortran Cluster Edition 2018_2 to 2019_0 and got a linkage error
"ambiguous", when I try to add an external library. I also use VS 2017.
The linker output from the command line linking is attached.
What to do to resolve the problem?
The ambiguity is that you have an option "/C:\....lib". Remove the leading "/", because the compiler/linker assumes that that is the start of a compiler/linker option, whereas you seem to mean the full name of a library.
I do not know what options may lead to the ambiguity itself, but it is clear that the slash is a mistake.