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diff --git a/README.os400 b/README.os400
index 572149b9..cd78916 100644
--- a/README.os400
+++ b/README.os400
@@ -36,6 +36,12 @@ Starting from OS/400 V5R2 the IBM Visual Age compiler is supported
 on OS/400 PASE, so it is possible to build Perl natively on OS/400.  
 The easier way, however, is to compile in AIX, as just described.
 
+If you don't want to install the compiled Perl in AIX into /QOpenSys
+(for packaging it before copying it to PASE), you can use a Configure
+parameter: -Dinstallprefix=/tmp/QOpenSys/perl.  This will cause the
+"make install" to install everything into that directory, while the
+installed files still think they are (will be) in /QOpenSys/perl.
+
 If building natively on PASE, please do the build under the /QOpenSys
 directory, since Perl is happier when built on a case sensitive filesystem.
 
@@ -69,6 +75,30 @@ PASE_EXEC_QOPENSYS="N".  If you have V5R1, you'll need to get the
 latest PTFs to have this feature.  Scripts starting with
 #!/QOpenSys/perl/bin/perl should always work.
 
+=head2 Known Problems
+
+When compiling in PASE, there is no "oslevel" command.  Therefore,
+you may want to create a script called "oslevel" that echoes the
+level of AIX that your version of PASE runtime supports.  If you're
+unsure, consult your documentation or use "4.3.3.0".
+
+If you have test cases that fail, check for the existence of spool files.
+The test case may be trying to use a syscall that is not implemented
+in PASE.  To avoid the SIGILL, try setting the PASE_SYSCALL_NOSIGILL
+environment variable or have a handler for the SIGILL.  If you can
+compile programs for PASE, run the config script and edit config.sh
+when it gives you the option.  If you want to remove fchdir(), which
+isn't implement in V5R1, simply change the line that says:
+
+d_fchdir='define'
+
+to
+
+d_fchdir='undef'
+
+and then compile Perl.  The places where fchdir() is used have
+alternatives for systems that do not have fchdir() available.
+
 =head2 Perl on ILE
 
 There exists a port of Perl to the ILE environment.  This port, however,