diff --git a/ocaml-ancient.spec b/ocaml-ancient.spec
index 42fb071..31ac4b4 100644
--- a/ocaml-ancient.spec
+++ b/ocaml-ancient.spec
@@ -4,7 +4,7 @@
 
 Name:           ocaml-ancient
 Version:        0.9.0
-Release:        23%{?dist}
+Release:        24%{?dist}
 Summary:        OCaml library for large memory structures and sharing
 License:        LGPLv2+ with exceptions
 
@@ -20,7 +20,6 @@ BuildRequires:  ocaml >= 3.10.0
 BuildRequires:  ocaml-findlib-devel
 BuildRequires:  ocaml-ocamldoc
 BuildRequires:  chrpath
-ExcludeArch:    sparc64 s390 s390x
 
 
 %description
@@ -65,7 +64,13 @@ pushd mmalloc
 make
 popd
 
-make CFLAGS='-g -fPIC -Wall -Werror -I%{ocamllibdir} -DOCAML_VERSION_MAJOR=$(OCAML_VERSION_MAJOR) -DOCAML_VERSION_MINOR=$(OCAML_VERSION_MINOR) %{optflags}'
+CFLAGS='-g -fPIC -Wall -Werror -I%{ocamllibdir} -DOCAML_VERSION_MAJOR=$(OCAML_VERSION_MAJOR) -DOCAML_VERSION_MINOR=$(OCAML_VERSION_MINOR) %{optflags}' \
+    make \
+%if %opt
+    all
+%else
+    ancient.cma META
+%endif
 
 make doc ||:
 
@@ -75,8 +80,13 @@ export DESTDIR=$RPM_BUILD_ROOT
 export OCAMLFIND_DESTDIR=$RPM_BUILD_ROOT%{_libdir}/ocaml
 mkdir -p $RPM_BUILD_ROOT%{_libdir}
 mkdir -p $OCAMLFIND_DESTDIR $OCAMLFIND_DESTDIR/stublibs
+%if %opt
 ocamlfind install ancient ancient.cmi *.mli *.cma ancient.cmx *.cmxa *.a *.so \
   mmalloc/*.a META
+%else
+ocamlfind install ancient ancient.cmi *.mli *.cma *.a *.so \
+  mmalloc/*.a META
+%endif
 
 chrpath --delete $OCAMLFIND_DESTDIR/stublibs/dll*.so
 
@@ -105,6 +115,9 @@ chrpath --delete $OCAMLFIND_DESTDIR/stublibs/dll*.so
 
 
 %changelog
+* Tue Jul 21 2015 Richard W.M. Jones <rjones@redhat.com> - 0.9.0-24
+- Fix bytecode compilation.
+
 * Wed Jun 24 2015 Richard W.M. Jones <rjones@redhat.com> - 0.9.0-23
 - ocaml-4.02.2 final rebuild.