diff --git a/ocaml-cairo-fno-common.patch b/ocaml-cairo-fno-common.patch
new file mode 100644
index 0000000..68636c5
--- /dev/null
+++ b/ocaml-cairo-fno-common.patch
@@ -0,0 +1,126 @@
+diff --git a/src/cairo_ocaml.h.p b/src/cairo_ocaml.h.p
+index 4192aed..78a02e2 100644
+--- a/src/cairo_ocaml.h.p
++++ b/src/cairo_ocaml.h.p
+@@ -25,7 +25,7 @@
+ /* cairo_t
+ ***********************************************************************/
+ #define CAIRO_VAL(v) (* (cairo_t **) Data_custom_val(v))
+-struct custom_operations caml_cairo_ops;
++CAMLextern struct custom_operations caml_cairo_ops;
+ 
+ void caml_cairo_raise_Error(cairo_status_t status);
+ /* raise [Cairo.Error] if the status indicates a failure. */
+@@ -33,7 +33,7 @@ void caml_cairo_raise_Error(cairo_status_t status);
+ /* cairo_pattern_t
+ ***********************************************************************/
+ #define PATTERN_VAL(v) (* (cairo_pattern_t **) Data_custom_val(v))
+-struct custom_operations caml_pattern_ops;
++CAMLextern struct custom_operations caml_pattern_ops;
+ 
+ #define EXTEND_VAL(v) ((cairo_extend_t) Int_val(v))
+ #define VAL_EXTEND(v) Val_int(v)
+@@ -45,12 +45,12 @@ struct custom_operations caml_pattern_ops;
+ ***********************************************************************/
+ 
+ #define FONT_OPTIONS_VAL(v) (* (cairo_font_options_t**) Data_custom_val(v))
+-struct custom_operations caml_font_options_ops;
++CAMLextern struct custom_operations caml_font_options_ops;
+ 
+ /* cairo_font_type_t
+ ***********************************************************************/
+ 
+-value caml_cairo_font_type[5];
++CAMLextern value caml_cairo_font_type[5];
+ 
+ cairo_font_type_t caml_cairo_font_type_val(value vft);
+ 
+@@ -61,13 +61,13 @@ cairo_font_type_t caml_cairo_font_type_val(value vft);
+ ***********************************************************************/
+ 
+ #define SCALED_FONT_VAL(v) (* (cairo_scaled_font_t**) Data_custom_val(v))
+-struct custom_operations caml_scaled_font_ops;
++CAMLextern struct custom_operations caml_scaled_font_ops;
+ 
+ /* cairo_surface_t
+ ***********************************************************************/
+ 
+ #define SURFACE_VAL(v) (* (cairo_surface_t **) Data_custom_val(v))
+-struct custom_operations caml_surface_ops;
++CAMLextern struct custom_operations caml_surface_ops;
+ 
+ /* Type cairo_content_t */
+ 
+@@ -93,7 +93,7 @@ struct custom_operations caml_surface_ops;
+ ***********************************************************************/
+ 
+ #define PATH_VAL(v) (* (cairo_path_t **) Data_custom_val(v))
+-struct custom_operations caml_path_ops;
++CAMLextern struct custom_operations caml_path_ops;
+ 
+ #define PATH_DATA_ASSIGN(vdata, data)                                   \
+   switch (data->header.type) {                                          \
+@@ -151,10 +151,10 @@ struct custom_operations caml_path_ops;
+ #include <cairo-ft.h>
+ 
+ #define FT_LIBRARY_VAL(v) (* (FT_Library*) Data_custom_val(v))
+-struct custom_operations caml_cairo_ft_library_ops;
++CAMLextern struct custom_operations caml_cairo_ft_library_ops;
+ 
+ #define FT_FACE_VAL(v) (* (FT_Face*) Data_custom_val(v))
+-struct custom_operations caml_cairo_ft_face_ops;
++CAMLextern struct custom_operations caml_cairo_ft_face_ops;
+ 
+ #endif /* OCAML_CAIRO_HAS_FT */
+ 
+diff --git a/src/cairo_ocaml_types.h b/src/cairo_ocaml_types.h
+index b850ae2..b036142 100644
+--- a/src/cairo_ocaml_types.h
++++ b/src/cairo_ocaml_types.h
+@@ -267,14 +267,6 @@ static intnat caml_cairo_font_options_hash(value v)
+   return(cairo_font_options_hash(FONT_OPTIONS_VAL(v)));
+ }
+ 
+-struct custom_operations caml_font_options_ops = {
+-  "font_options_t", /* identifier for serialization and deserialization */
+-  &caml_cairo_font_options_finalize,
+-  &caml_cairo_font_options_compare,
+-  &caml_cairo_font_options_hash,
+-  custom_serialize_default,
+-  custom_deserialize_default };
+-
+ 
+ /* caml_cairo_font_type is defined in "cairo_ocaml.h". */
+ CAMLexport value caml_cairo_font_type_init(value unit)
+diff --git a/src/cairo_stubs.c b/src/cairo_stubs.c
+index de35aca..60fae71 100644
+--- a/src/cairo_stubs.c
++++ b/src/cairo_stubs.c
+@@ -34,6 +34,27 @@
+ #include "cairo_macros.h"
+ #include "cairo_ocaml_types.h"
+ 
++CAMLexport value caml_cairo_font_type[5];
++
++CAMLexport struct custom_operations caml_cairo_ops;
++CAMLexport struct custom_operations caml_pattern_ops;
++CAMLexport struct custom_operations caml_scaled_font_ops;
++CAMLexport struct custom_operations caml_surface_ops;
++CAMLexport struct custom_operations caml_path_ops;
++
++#ifdef OCAML_CAIRO_HAS_FT
++CAMLexport struct custom_operations caml_cairo_ft_library_ops;
++CAMLexport struct custom_operations caml_cairo_ft_face_ops;
++#endif
++
++CAMLexport struct custom_operations caml_font_options_ops = {
++  "font_options_t", /* identifier for serialization and deserialization */
++  &caml_cairo_font_options_finalize,
++  &caml_cairo_font_options_compare,
++  &caml_cairo_font_options_hash,
++  custom_serialize_default,
++  custom_deserialize_default };
++
+ /* cairo_t functions.
+ ***********************************************************************/
+ 
diff --git a/ocaml-cairo.spec b/ocaml-cairo.spec
index 515fd90..315247f 100644
--- a/ocaml-cairo.spec
+++ b/ocaml-cairo.spec
@@ -25,6 +25,9 @@ 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
+# Fix builds of consuming packages with -fno-common.
+# https://github.com/Chris00/ocaml-cairo/pull/20
+Patch1:         %{name}-fno-common.patch
 
 BuildRequires:  ocaml >= 4.02
 BuildRequires:  ocaml-dune-devel
@@ -250,6 +253,7 @@ dune runtest
 - Add -gtk-devel and -pango-devel subpackages to manage dependencies
 - Add %%check script
 - Add -test patch until upstream weighs in on GC issues
+- Add -fno-common patch to fix builds of consuming packages with GCC 10
 
 * Sun Jan 19 2020 Richard W.M. Jones <rjones@redhat.com> - 2:0.4.7-0.28.gitbe5a298
 - OCaml 4.10.0+beta1 rebuild.