The problematic line is this line:

Note (probably harmless): No library found for -lstree
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I don't know why MakeMaker outputs this "propably harmless" message, because in my experience, it has never been harmless whenever I encountered it. This error message means that the Makefile.PL could not find the library stree, most likely because you didn't supply the correct -L and -I switches to it. This seems especially valid as your stree library is installed in an uncommon path I think.

You will have to run your Makefile.PL manually and supply the correct paths to where the header/include files of the stree library got installed. Most likely like:

perl -w Makefile.PL "INCLUDE=-I ../stree/include" "LIBS=-L ../stree/li
+b"
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