Fix typo in the `arch` commandline
diff --git a/configure.in b/configure.in
index 0c96c5a..75857ef 100644
--- a/configure.in
+++ b/configure.in
@@ -916,7 +916,7 @@
 
 	         elif test "$UNIVERSAL_ARCHS" = "all" ; then
 		   UNIVERSAL_ARCH_FLAGS="-arch i386 -arch ppc -arch ppc64 -arch x86_64"
-		   ARCH_RUN_32BIT="arch -386 -ppc"
+		   ARCH_RUN_32BIT="arch -i386 -ppc"
 
 		 else
 	           AC_MSG_ERROR([proper usage is --with-universalarch=32-bit|64-bit|all])