Hi Marc,
I like to build flext externals individually and also combine them into a library. The "lib1" tutorial shows how to build an external with many internal objects, but not how to combine individual flext externals into a library.
i'm not sure if i get it right, but you have to decide beforehand whether you want standalone externals (with the FLEXT_NEW statement) or external objects that are part of a library (FLEXT_LIB). It's not possible with flext to combine ready-made standalone externals into a library. With standard pure pd however (without flext), you can link the object files of the standalone externals (but not the dlls or pd_linuxs or pd_darwins [or pd_irixs?]) combined with a setup function for the library.
best greetings, Thomas