"brian m. carlson" [off-list ref] writes:

+test_lazy_prereq SVN '
+	test_have_prereq PERL && test -n "$NO_SVN_TESTS" && perl -w -e "
+		use SVN::Core;
+		use SVN::Repos;
+		\$SVN::Core::VERSION gt '1.1.0' or exit(42);
+	"
+'

If "have_prereq PERL" is not satisfied, SVN is not satisfied.

If NO_SVN_TESTS is an empty string (or unset), "test -n" fails, and
SVN is not satisfied.  Questionable---am I misreading this part of
the logic???

The perl script would not barf only if use SVN::* succeed and then
SVN::Core::VERSION is strictly better than '1.1.0'.  If not, i.e.,
libsvn-perl is not available, or its version is older, then we fail
with exit(42), and SVN is not satisfied.