diff --git a/lib/gxg/gxg_mysql.rb b/lib/gxg/gxg_mysql.rb
index 792d600..43c1a9a 100644
--- a/lib/gxg/gxg_mysql.rb
+++ b/lib/gxg/gxg_mysql.rb
@@ -1 +1,5 @@
 #
+if defined?(::External::Database::Mysql)
+else
+    require "mysql2"
+end
\ No newline at end of file
diff --git a/lib/gxg/gxg_postgres.rb b/lib/gxg/gxg_postgres.rb
index 792d600..267f548 100644
--- a/lib/gxg/gxg_postgres.rb
+++ b/lib/gxg/gxg_postgres.rb
@@ -1 +1,5 @@
 #
+if defined?(::External::Database::Postgres)
+else
+    require "pg"
+end
\ No newline at end of file
diff --git a/lib/gxg/gxg_sqlite.rb b/lib/gxg/gxg_sqlite.rb
index 792d600..5a7073a 100644
--- a/lib/gxg/gxg_sqlite.rb
+++ b/lib/gxg/gxg_sqlite.rb
@@ -1 +1,5 @@
 #
+if defined?(::External::Database::Sqlite)
+else
+    require "sqlite3"
+end
\ No newline at end of file