diff --git a/lablgtk-2.18.8-ocaml410.patch b/lablgtk-2.18.8-ocaml410.patch
new file mode 100644
index 0000000..f4b538d
--- /dev/null
+++ b/lablgtk-2.18.8-ocaml410.patch
@@ -0,0 +1,12 @@
+diff -ur lablgtk-2.18.8.old/src/wrappers.h lablgtk-2.18.8.fix/src/wrappers.h
+--- lablgtk-2.18.8.old/src/wrappers.h	2019-04-25 08:50:43.000000000 +0100
++++ lablgtk-2.18.8.fix/src/wrappers.h	2020-01-19 12:30:04.618485205 +0000
+@@ -33,7 +33,7 @@
+ #include <caml/mlvalues.h>
+ #include <caml/fail.h>
+ #include <caml/custom.h>
+-CAMLextern char *young_start, *young_end; /* from minor_gc.h */
++//CAMLextern char *young_start, *young_end; /* from minor_gc.h */
+ 
+ CAMLexport value copy_memblock_indirected (void *src, asize_t size);
+ value alloc_memblock_indirected (asize_t size);
diff --git a/ocaml-lablgtk.spec b/ocaml-lablgtk.spec
index 99797a6..a76b75c 100644
--- a/ocaml-lablgtk.spec
+++ b/ocaml-lablgtk.spec
@@ -11,6 +11,9 @@ License:        LGPLv2 with exceptions
 URL:            http://lablgtk.forge.ocamlcore.org/
 Source:         https://github.com/garrigue/lablgtk/releases/download/lablgtk2188/lablgtk-%{version}.tar.gz
 
+# Fix for OCaml 4.10.
+Patch1:         lablgtk-2.18.8-ocaml410.patch
+
 Obsoletes:      lablgtk <= 2.6.0-7
 Provides:       lablgtk = 2.6.0-7
 
@@ -52,6 +55,7 @@ developing applications that use %{name}.
 
 %prep
 %setup -q -n lablgtk-%{version}
+%patch1 -p1
 
 
 %build