--- cvsroot/IO-AIO/Makefile.PL	2006/05/08 17:10:27	1.9
+++ cvsroot/IO-AIO/Makefile.PL	2006/10/26 16:28:33	1.10
@@ -31,6 +31,26 @@
       and die "\nconfigure failed, check it's output above and autoconf/config.log\n\n";
 }
 
+if ($^O =~ /linux/ && $Config{usemymalloc} eq "y") {
+   print <<EOF;
+
+***
+*** WARNING:
+***
+*** Your perl uses it's own memory allocator (-Dusemymalloc=y),
+*** which is known not to be threadsafe on GNU/Linux and probably
+*** other platforms (even when not used concurrently, it trashes
+*** the data structures of the system malloc running concurrently),
+*** for perls up to 5.8.8 and possibly later versions.
+***
+*** If you are unsure wether your perl has been fixed, your system
+*** is safe for other reasons, or you experience spurious segfaults,
+*** please compile your perl with -Dusemymalloc=n.
+***
+
+EOF
+}
+
 my $mm = MM->new({
     dist         => {
        PREOP	=> 'pod2text AIO.pm | tee README >$(DISTVNAME)/README; chmod -R u=rwX,go=rX . ;',