Build Unix-friendly versions directly from library.
diff --git a/unix/make/Make.SunOS-sun4u b/unix/make/Make.SunOS-sun4u
new file mode 100644
index 0000000..c5fe67b
--- /dev/null
+++ b/unix/make/Make.SunOS-sun4u
@@ -0,0 +1,2 @@
+include Make.SunOS-sun4u-$(CC)
+NAN=nan64.$O