diff --git a/ocaml-ounit.spec b/ocaml-ounit.spec
index cabeacf..1195ec6 100644
--- a/ocaml-ounit.spec
+++ b/ocaml-ounit.spec
@@ -4,9 +4,14 @@
 
 %global srcname ounit
 
+# -doc subpackage requires ocaml-odoc which has rather a lot of
+# dependencies.  This flag allows the non-essential subpackage to be
+# enabled.
+%bcond_with doc
+
 Name:           ocaml-%{srcname}
 Version:        2.2.2
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Unit test framework for OCaml
 
 License:        MIT
@@ -23,7 +28,9 @@ BuildRequires:  ocaml-findlib
 BuildRequires:  ocaml-lwt-devel
 BuildRequires:  ocaml-mmap-devel
 BuildRequires:  ocaml-ocplib-endian-devel
+%if %{with doc}
 BuildRequires:  ocaml-odoc
+%endif
 BuildRequires:  ocaml-result-devel
 
 # The ounit name is now just an alias for ounit2
@@ -86,7 +93,9 @@ Documentation for %{name}.
 
 %build
 dune build %{?_smp_mflags}
+%if %{with doc}
 dune build %{?_smp_mflags} @doc
+%endif
 
 
 %check
@@ -96,8 +105,10 @@ dune runtest
 %install
 dune install --destdir=%{buildroot}
 
+%if %{with doc}
 # We do not want the dune markers
 find _build/default/_doc/_html -name .dune-keep -delete
+%endif
 
 # We install the documentation with the doc macro
 rm -fr %{buildroot}%{_prefix}/doc
@@ -177,16 +188,19 @@ find %{buildroot}%{_libdir}/ocaml -name \*.cmxs -exec chmod a+x {} \+
 %{_libdir}/ocaml/%{srcname}2-lwt/oUnitLwt.ml
 
 
+%if %{with doc}
 %files doc
 %doc _build/default/_doc/_html/
 %doc _build/default/_doc/_mlds/
 %doc _build/default/_doc/_odoc/
 %license LICENSE.txt
+%endif
 
 
 %changelog
-* Wed Feb 26 2020 Richard W.M. Jones <rjones@redhat.com> - 2.2.2-2
+* Wed Feb 26 2020 Richard W.M. Jones <rjones@redhat.com> - 2.2.2-3
 - OCaml 4.10.0 final.
+- Make -doc subpackage optional, disabled for now.
 
 * Fri Feb  7 2020 Jerry James <loganjerry@gmail.com> - 2.2.2-1
 - New upstream version 2.2.2