Add -test patch until upstream weighs in on GC issues.

ocaml-cairo-test.patch

@@ -0,0 +1,21 @@
+--- a/tests/image_create.ml
++++ b/tests/image_create.ml
+@@ -2,14 +2,15 @@ open Printf
+ open Cairo
+ open Bigarray
+ 
+-let create() =
+-  let data = Array1.create int8_unsigned c_layout 360_000 in
++let create data =
+   Gc.finalise (fun _ -> eprintf "DESTROY bigarray 'data'\n%!") data;
+   let surf = Image.create_for_data8 data Image.RGB24 ~w:300 ~h:300 in
+   Cairo.create surf
+ 
++let data = Array1.create int8_unsigned c_layout 360_000;;
++
+ let () =
+-  let cr = create() in
++  let cr = create data in
+   set_source_rgb cr 1. 1. 1.;
+   rectangle cr 0. 0. ~w:300. ~h:300.;
+   fill cr;

ocaml-cairo.spec

@@ -22,6 +22,9 @@ License:        LGPLv3+
 URL:            https://github.com/Chris00/%{name}
 
 Source0:        %{url}/releases/download/%{version}/cairo2-%{version}.tbz
+# Avoid a GC-related segfault.  See:
+# https://github.com/Chris00/ocaml-cairo/issues/19
+Patch0:         %{name}-test.patch
 
 BuildRequires:  ocaml >= 4.02
 BuildRequires:  ocaml-dune-devel
@@ -108,7 +111,7 @@ for developing applications that use %{name}-pango.
 
 
 %prep
-%autosetup -n cairo2-%{version}
+%autosetup -n cairo2-%{version} -p1
 
 
 %build
@@ -244,6 +247,7 @@ dune runtest
 - Add -gtk and -pango subpackages corresponding to upstream's opam packages
 - Add -gtk-devel and -pango-devel subpackages to manage dependencies
 - Add %%check script
+- Add -test patch until upstream weighs in on GC issues
 
 * Sun Jan 19 2020 Richard W.M. Jones <rjones@redhat.com> - 2:0.4.7-0.28.gitbe5a298
 - OCaml 4.10.0+beta1 rebuild.