Install headers, allow local ladspa

src/config/discover.ml

@@ -2,17 +2,16 @@ module C = Configurator.V1
 
 let () =
   C.main ~name:"ladspa-header" (fun c ->
-      try
-        let defined =
-          C.C_define.import c ~includes:["ladspa.h"]
-            [("LADSPA_VERSION", C.C_define.Type.String)]
-        in
-        match defined with
-          | [("LADSPA_VERSION", C.C_define.Value.String _)] ->
-              C.C_define.gen_header_file c ~fname:"config.h"
-                [("HAS_LADSPA", C.C_define.Value.String "true")]
-          | _ -> assert false
-      with _ ->
-        failwith
-          "Cannot find ladspa.h, please install the LADSPA_SDK, or put \
-           ladspa.h somewhere it can be found")
+      let has_ladspa =
+        try
+          let defined =
+            C.C_define.import c ~includes:["ladspa.h"]
+              [("LADSPA_VERSION", C.C_define.Type.String)]
+          in
+          match defined with
+            | [("LADSPA_VERSION", C.C_define.Value.String _)] -> true
+            | _ -> false
+        with _ -> false
+      in
+      C.C_define.gen_header_file c ~fname:"ocaml_ladspa_config.h"
+        [("HAS_LADSPA", C.C_define.Value.Switch has_ladspa)])

src/dune

@@ -3,12 +3,13 @@
  (public_name ladspa)
  (synopsis "OCaml bindings for ladspa")
  (libraries unix)
+ (install_c_headers ladspa ocaml_ladspa_config ocaml_ladspa)
  (foreign_stubs
   (language c)
   (names ladspa_stubs)
-  (extra_deps config.h)))
+  (extra_deps ocaml_ladspa_config.h)))
 
 (rule
- (targets config.h)
+ (targets ocaml_ladspa_config.h)
  (action
   (run ./config/discover.exe)))