diff -ur sexplib310-4.0.1.orig/lib_test/OMakefile sexplib310-4.0.1.unix-fix/lib_test/OMakefile
--- sexplib310-4.0.1.orig/lib_test/OMakefile	2008-08-20 19:03:20.000000000 +0100
+++ sexplib310-4.0.1.unix-fix/lib_test/OMakefile	2008-08-31 11:25:58.000000000 +0100
@@ -1,6 +1,6 @@
 OCAML_LIBRARIES = sexplib
 
-OCamlMakePPDeps($(PA_SEXP_CONV), conv_test)
+OCamlMakePPDeps($(PA_SEXP_CONV), conv_test, unix)
 
 OCamlMakeProjDefaults(conv_test.exe sexp_test.exe)