diff --git a/ocaml-camomile.spec b/ocaml-camomile.spec
index 7eebf45..83bc018 100644
--- a/ocaml-camomile.spec
+++ b/ocaml-camomile.spec
@@ -2,7 +2,7 @@
 
 Name:           ocaml-camomile
 Version:        0.8.5
-Release:        10%{?dist}
+Release:        11%{?dist}
 Summary:        Unicode library for OCaml
 
 # Several files are MIT and UCD licensed, but the overall work is LGPLv2+
@@ -15,8 +15,6 @@ Source0:        http://downloads.sourceforge.net/camomile/camomile-%{version}.ta
 # Use ocamlopt -g option to enable debuginfo.
 Patch1:         camomile-0.8.3-enable-debug.patch
 
-ExcludeArch:    sparc64 s390 s390x
-
 BuildRequires:  ocaml >= 3.12.1-12
 BuildRequires:  ocaml-findlib-devel
 BuildRequires:  ocaml-ocamldoc
@@ -40,6 +38,7 @@ The %{name}-devel package contains libraries and signature files for
 developing applications that use %{name}.
 
 
+%if %opt
 %package        data
 Summary:        Data files for %{name}
 Requires:       %{name} = %{version}-%{release}
@@ -48,6 +47,7 @@ Requires:       %{name} = %{version}-%{release}
 %description    data
 The %{name}-data package contains data files for developing
 applications that use %{name}.
+%endif
 
 
 %prep
@@ -60,7 +60,11 @@ applications that use %{name}.
 # Parallel builds don't work.
 unset MAKEFLAGS
 ./configure --prefix=%{_prefix} --datadir=%{_datadir} --libdir=%{_libdir}
+%if %opt
 make
+%else
+make byte
+%endif
 make dochtml
 make man
 
@@ -104,13 +108,19 @@ cp tools/camomilelocaledef.opt $RPM_BUILD_ROOT%{_bindir}/camomilelocaledef
 %{_libdir}/ocaml/camomile/*.mli
 
 
+%if %opt
 %files data
 %defattr(-,root,root,-)
 %doc README
 %{_datadir}/camomile/
+%endif
 
 
 %changelog
+* Tue Jul 21 2015 Richard W.M. Jones <rjones@redhat.com> - 0.8.5-11
+- Enable bytecode builds.
+- Disable the ocaml-camomile-data package on bytecode builds.
+
 * Tue Jun 23 2015 Richard W.M. Jones <rjones@redhat.com> - 0.8.5-10
 - Bump release and rebuild.