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diff --git a/hints/os390.sh b/hints/os390.sh
index 029eea2..d6f6821 100644
--- a/hints/os390.sh
+++ b/hints/os390.sh
@@ -1,4 +1,7 @@
 # hints/os390.sh
+#
+# OS/390 hints by David J. Fiander <davidf@mks.com>
+#
 # OS/390 OpenEdition Release 3 Mon Sep 22 1997 thanks to:
 #     
 #     John Pfuntner <pfuntner@vnet.ibm.com>
@@ -11,23 +14,96 @@
 #  as well as the authors of the aix.sh file
 #
 
+# To get ANSI C, we need to use c89, and ld doesn't exist
 cc='c89'
-ccflags='-DOEMVS -D_OE_SOCKETS -D_XOPEN_SOURCE_EXTENDED -D_ALL_SOURCE'
+ld='c89'
+# To link via definition side decks we need the dll option
+cccdlflags='-W 0,dll,"langlvl(extended)"'
+# c89 hides most of the useful header stuff, _ALL_SOURCE turns it on again,
+# YYDYNAMIC ensures that the OS/390 yacc generated parser is reentrant.
+# -DEBCDIC should come from Configure.
+ccflags='-DMAXSIG=38 -DOEMVS -D_OE_SOCKETS -D_XOPEN_SOURCE_EXTENDED -D_ALL_SOURCE -DYYDYNAMIC'
+# Turning on optimization breaks perl
 optimize='none'
+
 alignbytes=8
-usemymalloc='y'
+
+usemymalloc='n'
+
 so='a'
+
+# On OS/390, libc.a doesn't really hold anything at all,
+# so running nm on it is pretty useless.
+usenm='n'
+
+# Dynamic loading doesn't work on OS/390 quite yet
+usedl='n'
 dlext='none'
+
+# Configure can't figure this out for some reason
 d_shmatprototype='define'
+
 usenm='false'
 i_time='define'
 i_systime='define'
-d_select='undef'
 
 # (from aix.sh)
 # uname -m output is too specific and not appropriate here
+# osname should come from Configure
 #
 case "$archname" in
 '') archname="$osname" ;;
 esac
 
+archobjs=ebcdic.o
+
+# We have our own cppstdin.
+echo 'cat >.$$.c; '"$cc"' -E -Wc,NOLOC ${1+"$@"} .$$.c; rm .$$.c' > cppstdin
+
+#
+# Note that Makefile.SH employs a bare yacc to generate 
+# perly.[hc] and a2p.[hc], hence you may wish to:
+#
+#    alias yacc='myyacc'
+#
+# Then if you would like to use myyacc and skip past the
+# following warnings try invoking Configure like so: 
+#
+#    sh Configure -Dbyacc=yacc
+#
+# This trick ought to work even if your yacc is byacc.
+#
+if test "X$byacc" = "Xbyacc" ; then
+    if test -e /etc/yyparse.c ; then
+        : we should be OK - perhaps do a test -r?
+    else
+        cat <<EOWARN >&4
+
+Warning.  You do not have a copy of yyparse.c, the default 
+yacc parser template file, in place in /etc.
+EOWARN
+        if test -e /samples/yyparse.c ; then
+            cat <<EOWARN >&4
+
+There does appear to be a template file in /samples though.
+Please run:
+
+      cp /samples/yyparse.c /etc
+
+before attempting to Configure the build of $package.
+
+EOWARN
+        else
+            cat <<EOWARN >&4
+
+There does not appear to be one in /samples either.  
+If you feel you can make use of an alternate yacc-like 
+parser generator then please read the comments in the
+hints/os390.sh file carefully.
+
+EOWARN
+        fi
+        exit 1
+    fi
+fi
+