--- a/src/libgo/configure.ac
+++ b/src/libgo/configure.ac
@@ -140,6 +140,7 @@
   *-*-netbsd*)	 is_netbsd=yes;  GOOS=netbsd ;;
   *-*-rtems*)    is_rtems=yes;   GOOS=rtems ;;
   *-*-solaris2*) is_solaris=yes; GOOS=solaris ;;
+  *-*-gnu*)      is_gnu=yes;     GOOS=gnu ;;
 esac
 AM_CONDITIONAL(LIBGO_IS_DARWIN, test $is_darwin = yes)
 AM_CONDITIONAL(LIBGO_IS_FREEBSD, test $is_freebsd = yes)
@@ -148,6 +149,7 @@
 AM_CONDITIONAL(LIBGO_IS_NETBSD, test $is_netbsd = yes)
 AM_CONDITIONAL(LIBGO_IS_RTEMS, test $is_rtems = yes)
 AM_CONDITIONAL(LIBGO_IS_SOLARIS, test $is_solaris = yes)
+AM_CONDITIONAL(LIBGO_IS_GNU, test $is_gnu = yes)
 AC_SUBST(GOOS)
 
 dnl N.B. Keep in sync with gcc/testsuite/go.test/go-test.exp (go-set-goarch).