Ocaml is not creating .o file

I'm new to ocaml and ubuntu and I'm trying to compile a very simple ocaml file following this tutorial : http://wiki.njh.eu/OCaml_and_SDL

开发者_运维技巧The problem is that it's not compiling I have the following error and I don't understand what to do :

cc   testsdl_1.o   -o testsdl_1
cc: testsdl_1.o: Aucun fichier ou dossier de ce type
cc: no input files
make: *** [testsdl_1] Erreur 1

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The compiler complains about the fact that testsdl_1.o does not exist, which means that it has not been generated. So, there has been an error somewhere before the lines you are quoted. You should provide more information if you want your problem to be solved (or provide a solution if you found one).