diff -Nurd zsnes-1.50.old/src/configure.in zsnes-1.50.new/src/configure.in
--- src/configure.in	2006-12-21 19:59:54.000000000 -0600
+++ src/configure.in	2006-12-29 05:10:26.000000000 -0600
@@ -200,14 +200,18 @@
   AC_ARG_VAR(force_arch, [Force architecture to optimize GCC/G++ for])
   AC_MSG_CHECKING(which cpu architecture to optimize for)
   if test x$force_arch != x; then
-    CFLAGS="$CFLAGS -march=$force_arch"
-    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]])],
-    [AC_MSG_RESULT(forcing $force_arch)],
-    [AC_MSG_RESULT($force_arch ??)
-    AC_MSG_WARN(incorrect force_arch parameter)
-    force_arch=""
-    CFLAGS="$CFLAGSBAK"
-    AC_MSG_CHECKING(for autodetected architecture)])
+    if test x$force_arch = xno; then
+      AC_MSG_RSULT(forcing no arch)
+    else
+      CFLAGS="$CFLAGS -march=$force_arch"
+      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]])],
+      [AC_MSG_RESULT(forcing $force_arch)],
+      [AC_MSG_RESULT($force_arch ??)
+      AC_MSG_WARN(incorrect force_arch parameter)
+      force_arch=""
+      CFLAGS="$CFLAGSBAK"
+      AC_MSG_CHECKING(for autodetected architecture)])
+    fi
   fi
   if test x$force_arch = x; then
     if test x$ARCH_INFO = x; then