diff --git a/build-aux/config.sub b/build-aux/config.sub
index 4670805..fd224f3 100755
--- a/build-aux/config.sub
+++ b/build-aux/config.sub
@@ -110,8 +110,16 @@ case $# in
     exit 1;;
 esac
 
+# Determine whether 'read' supports the '-r' flag.
+# /bin/sh on Solaris 10 does not.
+if (echo x | read -r f) 2>/dev/null; then
+  read_raw='-r'
+else
+  read_raw=
+fi
+
 # Split fields of configuration type
-IFS="-" read -r field1 field2 field3 field4 <<EOF
+IFS="-" read $read_raw field1 field2 field3 field4 <<EOF
 $1
 EOF
 
@@ -918,7 +926,7 @@ case $basic_machine in
 		;;
 
 	*-*)
-		IFS="-" read -r cpu vendor <<EOF
+		IFS="-" read $read_raw cpu vendor <<EOF
 $basic_machine
 EOF
 		;;