Add warning about dumb SGI make.

diff --git a/README b/README
index a9499dc22f36c27cabae921caca4ef725783c229..64ecbdd8eb0510643c6d5bb86a9be3b3a3f346f5 100644 (file)
--- a/README
+++ b/README
@@ -289,6 +289,12 @@ Cray T3E: Konrad Hinsen writes:
        If you run the test suite, two tests will fail (rotate and binascii),
        but these are not the modules you'd expect to need on a Cray.
 
+SGI:   SGI's standard "make" utility (/bin/make or /usr/bin/make)
+       does not check whether a command actually changed the file it
+       is supposed to build.  This means that whenever you say "make"
+       it will redo the link step.  The remedy is to use SGI's much
+       smarter "smake " utility (/usr/bin/smake), or GNU make.
+
 
 Configuring additional built-in modules
 ---------------------------------------