Make the -doc subpackage conditional.

ocaml-ppx-tools.spec

@@ -2,6 +2,10 @@
 %global debug_package %{nil}
 %endif
 
+# Documentation adds a circular dependency, so by
+# default we build without.
+%bcond_with doc
+
 %global srcname ppx-tools
 %global upname  ppx_tools
 
@@ -17,7 +21,9 @@ Source0:        %{url}/archive/%{version}/%{upname}-%{version}.tar.gz
 BuildRequires:  ocaml >= 4.08.0
 BuildRequires:  ocaml-cppo
 BuildRequires:  ocaml-dune >= 1.6
+%if %{with doc}
 BuildRequires:  ocaml-odoc
+%endif
 
 %description
 Tools for authors of syntactic tools (such as ppx rewriters).
@@ -30,25 +36,31 @@ Requires:       %{name}%{?_isa} = %{version}-%{release}
 The %{name}-devel package contains libraries and signature files for
 developing applications that use %{name}.
 
+%if %{with doc}
 %package        doc
 Summary:        Documentation for %{name}
 BuildArch:      noarch
 
 %description    doc
 Documentation for %{name}.
+%endif
 
 %prep
 %autosetup -n %{upname}-%{version}
 
 %build
 dune build %{?_smp_mflags}
+%if %{with doc}
 dune build %{?_smp_mflags} @doc
+%endif
 
 %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 do not want the ml files
 find %{buildroot}%{_libdir}/ocaml -name \*.ml -delete
@@ -101,15 +113,18 @@ dune runtest
 %{_libdir}/ocaml/%{upname}/*.mli
 %{_libdir}/ocaml/%{upname}/*/*.cmt
 
+%if %{with doc}
 %files doc
 %doc _build/default/_doc/_html/
 %doc _build/default/_doc/_mlds/
 %doc _build/default/_doc/_odoc/
 %license LICENSE
+%endif
 
 %changelog
 * Mon Mar  1 12:17:35 GMT 2021 Richard W.M. Jones <rjones@redhat.com> - 6.3-4
 - OCaml 4.12.0 build
+- Make the -doc subpackage conditional.
 
 * Sat Feb 20 2021 Jerry James <loganjerry@gmail.com> - 6.3-3
 - Bump and rebuild