diff --git a/src/database.c b/src/database.c
index cc2942b..e43cda9 100644
--- a/src/database.c
+++ b/src/database.c
@@ -20,6 +20,13 @@
 #include "Database.h"
 #include "../config.h"
 
+#ifndef PREFIX
+# define PREFIX		"/usr/local"
+#endif
+#ifndef LIBDIR
+# define LIBDIR		PREFIX "/lib"
+#endif
+
 
 /* Database */
 /* private */
diff --git a/src/project.conf b/src/project.conf
index c272c3e..a2c93d8 100644
--- a/src/project.conf
+++ b/src/project.conf
@@ -13,3 +13,4 @@ install=$(LIBDIR)
 
 [database.c]
 depends=../include/Database/database.h,../config.h
+cppflags=-D PREFIX=\"$(PREFIX)\" -D LIBDIR=\"$(LIBDIR)\"