diff --git a/database/mysql/detect.py b/database/mysql/detect.py
index 74c5054..980519f 100644
--- a/database/mysql/detect.py
+++ b/database/mysql/detect.py
@@ -58,11 +58,14 @@ def configure(env):
 
     if not mariadb_error:
         env.ParseConfig("pkg-config mariadb --cflags --libs")
+        env.Append(CPPDEFINES=["MYSQL_PRESENT"])
         return
 
     if not mysql_error:
         env.ParseConfig("pkg-config mysql --cflags --libs")
 
+    env.Append(CPPDEFINES=["MYSQL_PRESENT"])
+
     # Link those statically for portability
     #if env["use_static_cpp"]:
         #env.Append(LINKFLAGS=["-static-libgcc", "-static-libstdc++"])
diff --git a/database/postgres/detect.py b/database/postgres/detect.py
index 27700be..939ba73 100644
--- a/database/postgres/detect.py
+++ b/database/postgres/detect.py
@@ -47,6 +47,8 @@ def get_flags():
 
 def configure(env):
     env.ParseConfig("pkg-config libpq --cflags --libs")
+    
+    env.Append(CPPDEFINES=["PGSQL_PRESENT"])
 
     # Link those statically for portability
     #if env["use_static_cpp"]:
diff --git a/database/sqlite/detect.py b/database/sqlite/detect.py
index 5bdd2bb..c289b3b 100644
--- a/database/sqlite/detect.py
+++ b/database/sqlite/detect.py
@@ -48,6 +48,8 @@ def get_flags():
 def configure(env):
     env.ParseConfig("pkg-config sqlite3 --cflags --libs")
 
+    env.Append(CPPDEFINES=["SQLITE_PRESENT"])
+
     # Link those statically for portability
     #if env["use_static_cpp"]:
         #env.Append(LINKFLAGS=["-static-libgcc", "-static-libstdc++"])