diff --git a/pngquant.spec b/pngquant.spec
index 7b7cb62..96aa9a7 100644
--- a/pngquant.spec
+++ b/pngquant.spec
@@ -37,13 +37,17 @@ preserves full alpha transparency. Generated images are compatible with all
 modern web browsers, and have better fallback in IE6 than 24-bit PNGs.
 
 %prep
-%setup -q -n %name-%version
+%setup -q
 
 %build
-./configure --prefix=%prefix --enable-sse --with-openmp
+./configure \
+	--prefix=%prefix \
+%ifarch x86_64 %ix86
+	--enable-sse \
+%endif
+	--extra-cflags='%{optflags}' \
+	--with-openmp
 
-  CFLAGS="%optflags -msse2 -DUSE_SSE=1" \
-CXXFLAGS="%optflags -msse2 -DUSE_SSE=1" \
 %__make %{?_smp_mflags}
 
 %install
@@ -52,9 +56,6 @@ CXXFLAGS="%optflags -msse2 -DUSE_SSE=1" \
 install --mode 0755 --strip %name %buildroot%_bindir
 install --mode 0644 CHANGELOG COPYRIGHT INSTALL README.md %buildroot%_docdir/%name
 
-%clean
-%__rm -rf %buildroot
-
 %files
 %defattr(-, root, root)
 %_bindir/*