alloc_custom.patch

diff --git a/src/qrencode_stubs.c b/src/qrencode_stubs.c
index 2e3389e..1956395 100644
--- a/src/qrencode_stubs.c
+++ b/src/qrencode_stubs.c
@@ -28,7 +28,7 @@ static struct custom_operations qrcode_ops = {

 /* Allocating a Caml custom block to hold the given QRcode * */
 static value alloc_QRcode(QRcode * w) {
-  value v = alloc_custom(&qrcode_ops, sizeof(QRcode *), 0, 1);
+  value v = caml_alloc_custom(&qrcode_ops, sizeof(QRcode *), 0, 1);
   QRcode_val(v) = w;
   return v;
 }
@@ -59,7 +59,7 @@ static struct custom_operations qrinput_ops = {

 /* Allocating a Caml custom block to hold the given QRinput * */
 static value alloc_QRinput(QRinput * w) {
-  value v = alloc_custom(&qrinput_ops, sizeof(QRinput *), 0, 1);
+  value v = caml_alloc_custom(&qrinput_ops, sizeof(QRinput *), 0, 1);
   QRinput_val(v) = w;
   return v;
 }

ubuntu.patch

diff --git a/src/config/discover.ml b/src/config/discover.ml
index f849950..d335e03 100644
--- a/src/config/discover.ml
+++ b/src/config/discover.ml
@@ -3,7 +3,7 @@ module C = Configurator.V1
 let () =
   C.main ~name:"libqrencode" begin fun c ->
     let default : C.Pkg_config.package_conf = {
-      libs   = ["-lqrencode -libpng16 -lz"];
+      libs   = ["-L/usr/lib/x86_64-linux-gnu -lqrencode -libpng16 -lz"];
       cflags = []
     } in
     let conf =