diff --git a/ocaml-ocplib-simplex.spec b/ocaml-ocplib-simplex.spec
index 245fe9b..2abbfaf 100644
--- a/ocaml-ocplib-simplex.spec
+++ b/ocaml-ocplib-simplex.spec
@@ -19,6 +19,7 @@ Patch0:         %{name}-tests.patch
 Patch1:         %{name}-destdir.patch
 
 BuildRequires:  autoconf
+BuildRequires:  make
 BuildRequires:  ocaml
 BuildRequires:  ocaml-findlib
 BuildRequires:  ocaml-num-devel
@@ -46,16 +47,15 @@ sed -i '/OCAMLFIND_DESTDIR/d' Makefile.in
 %build
 %configure
 %ifarch %{ocaml_native_compiler}
-make %{?_smp_mflags} opt
+%make_build opt
 %else
-make %{?_smp_mflags} byte
+%make_build byte
 %endif
 
 %install
-export DESTDIR=%{buildroot}
 export OCAMLFIND_DESTDIR=%{buildroot}%{_libdir}/ocaml
 mkdir -p $OCAMLFIND_DESTDIR
-make install
+%make_install
 
 %check
 make local-tests