diff --git a/macros.ghc b/macros.ghc
index 3ddc86e..05d8d52 100644
--- a/macros.ghc
+++ b/macros.ghc
@@ -34,7 +34,7 @@ fi\
 subsubdir=lib/\
 %endif\
 %cabal --version\
-%cabal configure %{?ghc_name:--with-compiler=%{_bindir}/ghc-%{ghc_version}} --prefix=%{_prefix} --libdir=%{_libdir} --docdir=%{_ghcdocdir} --libsubdir='$compiler'/${subsubdir}'$pkgid' --datasubdir='$pkgid' --libexecsubdir='$pkgid' --ghc --dynlibdir=%{?_ghcdynlibdir}%{?!_ghcdynlibdir:%{_libdir}/ghc-%{ghc_version}} %{!?ghc_without_dynamic:--enable-executable-dynamic} %{?with_tests:--enable-tests} %{?ghc_subpackaging:--user}%{!?ghc_subpackaging:--global} --ghc-options="${CFLAGS:+$(echo ' '$CFLAGS | sed -e 's/ / -optc/g')} ${LDFLAGS:+$(echo ' '$LDFLAGS | sed -e 's/ / -optl/g')} -fhide-source-paths" %{?cabal_configure_options} $cabal_configure_extra_options
+%cabal configure %{!-W:%{?ghc_name:--with-compiler=%{_bindir}/ghc-%{ghc_version}}} --prefix=%{_prefix} --libdir=%{_libdir} --docdir=%{_ghcdocdir} --libsubdir='$compiler'/${subsubdir}'$pkgid' --datasubdir='$pkgid' --libexecsubdir='$pkgid' --ghc --dynlibdir=%{?_ghcdynlibdir}%{?!_ghcdynlibdir:%{_libdir}/ghc-%{ghc_version}} %{!?ghc_without_dynamic:--enable-executable-dynamic} %{?with_tests:--enable-tests} %{?ghc_subpackaging:--user}%{!?ghc_subpackaging:--global} --ghc-options="${CFLAGS:+$(echo ' '$CFLAGS | sed -e 's/ / -optc/g')} ${LDFLAGS:+$(echo ' '$LDFLAGS | sed -e 's/ / -optl/g')} -fhide-source-paths" %{?cabal_configure_options} $cabal_configure_extra_options
 
 # install
 %cabal_install %cabal copy --destdir=%{buildroot} %{?cabal_install_options}
@@ -161,8 +161,8 @@ if [ -f $f -a -x $f ]; then chmod a-x $f; fi\
 done\
 %{nil}
 
-# ghc_bin_build
-%ghc_bin_build\
+# ghc_bin_build: -W: use default ghc (ie ignore ghc_name)
+%ghc_bin_build(W)\
 %ghc_fix_doc_perms\
 %{?!ghc_debuginfo:%undefine _enable_debug_packages}\
 %cabal_configure\