diff --git a/libgo/configure.ac b/libgo/configure.ac
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -282,8 +282,8 @@ AC_SUBST(GO_SYSCALL_OS_ARCH_FILE)
 dnl Special flags used to generate sysinfo.go.
 OSCFLAGS="-D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
 case "$target" in
-    *-*-solaris2.[[89]])
-	# Solaris 8/9 need this so struct msghdr gets the msg_control
+    *-*-solaris2.9)
+	# Solaris 9 needs this so struct msghdr gets the msg_control
 	# etc. fields in <sys/socket.h> (_XPG4_2).
 	OSCFLAGS="$OSCFLAGS -D_XOPEN_SOURCE=500 -D_XOPEN_SOURCE_EXTENDED -D__EXTENSIONS__"
 	;;
@@ -623,7 +623,7 @@ fi
 dnl Check if makecontext expects the uc_stack member of ucontext to point
 dnl to the top of the stack.
 case "$target" in
-  sparc*-*-solaris2.[[89]]*)
+  sparc*-*-solaris2.9*)
     libgo_cv_lib_makecontext_stack_top=yes
     ;;
   *)