diff --git a/infer/src/Makefile.in b/infer/src/Makefile.in
index b704d788f..d4c9c99a0 100644
--- a/infer/src/Makefile.in
+++ b/infer/src/Makefile.in
@@ -77,7 +77,17 @@ OCAMLBUILD_OPTIONS = \
                      $(OCAMLBUILD_BINANNOT_OPTIONS) \
                      $(OCAMLBUILD_QUIET_OPTIONS) \
                      -classic-display \
-                     -cflags -warn-error,@5@8@10..12@20@26@39 \
+                     -cflags -principal \
+                     -cflags -w,@5 \
+                     -cflags -w,@8 \
+                     -cflags -w,@10 \
+                     -cflags -w,@11 \
+                     -cflags -w,@12 \
+                     -cflags -w,@18 \
+                     -cflags -w,@19 \
+                     -cflags -w,@20 \
+                     -cflags -w,@26 \
+                     -cflags -w,@39 \
                      -lflags $(OCAML_INCLUDES) \
                      -cflags $(OCAML_INCLUDES) \
                      $(addprefix -lib ,$(OCAML_LIBS)) \
diff --git a/infer/src/backend/localise.ml b/infer/src/backend/localise.ml
index 1bba02f90..95c6f923e 100644
--- a/infer/src/backend/localise.ml
+++ b/infer/src/backend/localise.ml
@@ -489,7 +489,7 @@ let dereference_string deref_str value_str access_opt loc =
     [(problem_str ^ " " ^ at_line tags loc)] in
   { no_desc with descriptions = value_desc:: access_desc @ problem_desc; tags = !tags }
 
-let parameter_field_not_null_checked_desc desc exp =
+let parameter_field_not_null_checked_desc (desc : error_desc) exp =
   let parameter_not_nullable_desc var =
     let var_s = Sil.pvar_to_string var in
     let param_not_null_desc =
diff --git a/infer/src/backend/procname.ml b/infer/src/backend/procname.ml
index 234989e42..3d4ef4156 100644
--- a/infer/src/backend/procname.ml
+++ b/infer/src/backend/procname.ml
@@ -281,7 +281,7 @@ let java_is_static = function
   | _ -> assert false
 
 (** Prints a string of a java procname with the given level of verbosity *)
-let java_to_string ?(withclass = false) j verbosity =
+let java_to_string ?(withclass = false) (j : java_signature) verbosity =
   match verbosity with
   | Verbose | Non_verbose ->
       (* if verbose, then package.class.method(params): rtype,
diff --git a/infer/src/harness/stacktrace.ml b/infer/src/harness/stacktrace.ml
index 923141501..1219b0b09 100644
--- a/infer/src/harness/stacktrace.ml
+++ b/infer/src/harness/stacktrace.ml
@@ -36,7 +36,7 @@ type stack_frame =
 type stack_trace = stack_frame list
 
 (** given [str_frame], try to resolve its components in [exe_env] *)
-let try_resolve_frame str_frame exe_env tenv =
+let try_resolve_frame (str_frame : str_frame) exe_env tenv =
   try
     let class_name = Mangled.from_string str_frame.class_str in
     (* find the class name in the tenv and get the procedure(s) whose names match the procedure name