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-rw-r--r--composite/database.hxx2
1 files changed, 2 insertions, 0 deletions
diff --git a/composite/database.hxx b/composite/database.hxx
index 36860df..ae7caf4 100644
--- a/composite/database.hxx
+++ b/composite/database.hxx
@@ -28,6 +28,8 @@
# include <odb/oracle/database.hxx>
#elif defined(DATABASE_MSSQL)
# include <odb/mssql/database.hxx>
+#else
+# error unknown database; did you forget to define the DATABASE_* macros?
#endif
inline std::auto_ptr<odb::database>