minor update to README.os390

Message-ID: <Pine.OSF.4.10.10101261425560.14820-100000@aspara.forte.com>

p4raw-id: //depot/perl@8556

diff --git a/README.os390 b/README.os390
index 3a87182..25041b9 100644 (file)
--- a/README.os390
+++ b/README.os390
@@ -46,7 +46,7 @@ The IBM document that described such USS system setup issues was
 SC28-1890-07 "OS/390 UNIX System Services Planning", in particular
 Chapter 6 on customizing the OE shell.
 
-GNU make for OS/390, which is required for the build of perl (as well as
+GNU make for OS/390, which is recommended for the build of perl (as well as
 building CPAN modules and extensions), is available from:
 
   http://www.mks.com/s390/gnu/index.htm
@@ -58,6 +58,15 @@ from source to eliminate any such trouble.  You might also find GNU make
 (as well as Perl and Apache) in the red-piece/book "Open Source Software 
 for OS/390 UNIX", SG24-5944-00 from IBM.
 
+If instead of the recommended GNU make you would like to use the system 
+supplied make program then be sure to install the default rules file 
+properly via the shell command:
+
+    cp /samples/startup.mk /etc
+
+and be sure to also set the environment variable _C89_CCMODE=1 (exporting
+_C89_CCMODE=1 is also a good idea for users of GNU make).
+
 You might also want to have GNU groff for OS/390 installed before
 running the `make install` step for Perl.