Index: src/tests/main.cpp
--- src/tests/main.cpp.orig
+++ src/tests/main.cpp
@@ -84,7 +84,7 @@ int main(int argc, char* argv[])
       const Botan_Tests::Test_Options opts(
          parser.get_arg_list("suites"),
          parser.get_arg_list("skip-tests"),
-         parser.get_arg_or("data-dir", "src/tests/data"),
+         parser.get_arg_or("data-dir", "${LOCALBASE}/share/botan-2/data"),
          parser.get_arg("pkcs11-lib"),
          parser.get_arg("provider"),
          parser.get_arg("drbg-seed"),