diff --git a/clisp-2.49-configure.dif b/clisp-2.49-configure.dif
index 6847a41..1e72e4d 100644
--- a/clisp-2.49-configure.dif
+++ b/clisp-2.49-configure.dif
@@ -149,7 +149,7 @@
    fi
  
 +  if [ -n "${MYCFLAGS}" ] ; then
-+    XCFLAGS=$XCFLAGS" ${MYCFLAGS}"
++    XCFLAGS=$XCFLAGS' ${MYCFLAGS}'
 +  fi
 +
  else
diff --git a/clisp.spec b/clisp.spec
index 5dff31e..135ffb2 100644
--- a/clisp.spec
+++ b/clisp.spec
@@ -234,7 +234,7 @@ port=''
 # Report final architectures
 #
 echo $(uname -i -m -p) %_build_arch %_arch
-echo | $CC $MYCFLAGS -v -E - 2>&1 | grep /cc1
+echo | $CC %{optflags} -v -E - 2>&1 | grep /cc1
 #
 # Environment for the case of missing terminal
 #