Error when executing format

[jcubic]

> (format "1+2=~a" (+ 1 2))
*** ERROR IN (console)@1.2 -- Unbound variable: format
1> (import (srfi 28))
*** ERROR IN (console)@1.2 -- Module not found
(##get-module '_define-library/define-library-expand)
1> (format "1+2=~a" (+ 1 2))
*** ERROR IN (console)@3.2 -- Unbound variable: format

[feeley]

If you go over to https://gambitscheme.org/try/ you will see that this works in Gambit. For it to work on try.scheme.org the Gambit libraries have to be installed in the lib subdirectory at the web site's root.