if [ "$os" ] --> if [ x"$os" != x"" ]

diff --git a/config.sub b/config.sub
index 9abec11c0ed75a159b9029614f8481dd0e3f4271..b79ce98a62005f51a1be16b4904a40bc1bcb83dd 100755 (executable)
--- a/config.sub
+++ b/config.sub
@@ -495,7 +495,7 @@ esac
 
 # Decode manufacturer-specific aliases for certain operating systems.
 
-if [ "$os" ]
+if [ x"$os" != x"" ]
 then
 case $os in
        # -solaris* is a basic system type, with this one exception.