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-rw-r--r--ext/dbm/dbm.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/dbm/dbm.c b/ext/dbm/dbm.c
index 69b7a6e7a7..0247387fdc 100644
--- a/ext/dbm/dbm.c
+++ b/ext/dbm/dbm.c
@@ -812,5 +812,7 @@ Init_dbm()
#ifdef DB_VERSION_STRING
rb_define_const(rb_cDBM, "VERSION", rb_str_new2(DB_VERSION_STRING));
+#else
+ rb_define_const(rb_cDBM, "VERSION", rb_str_new2("unknown"));
#endif
}