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-rw-r--r--README.os39011
1 files changed, 10 insertions, 1 deletions
diff --git a/README.os390 b/README.os390
index 3a87182df3..25041b9518 100644
--- 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.