--- openvas-libraries.tmpl.in.orig
+++ openvas-libraries.tmpl.in
@@ -61,7 +61,8 @@
 DEBUG_SSL = @debug_ssl@
 
 # Some defines you may want to modify
-DEFS=@DEFS@ $(DEBUG_SSL) $(DEBUG)
+CPPFLAGS=@CPPFLAGS@
+DEFS=@DEFS@ $(CFLAGS) $(CPPFLAGS)
 LDFLAGS=@LDFLAGS@
 
 # Your C compiler