diff -pru perl5.004_64/lib/ExtUtils/Mksymlists.pm perl5.004_64-thr/lib/ExtUtils/Mksymlists.pm
--- perl5.004_64/lib/ExtUtils/Mksymlists.pm	Mon Mar 16 10:30:02 1998
+++ perl5.004_64-thr/lib/ExtUtils/Mksymlists.pm	Sat Apr  4 00:39:44 1998
@@ -7,7 +7,7 @@ use Exporter;
 use vars qw( @ISA @EXPORT $VERSION );
 @ISA = 'Exporter';
 @EXPORT = '&Mksymlists';
-$VERSION = substr q$Revision: 1.16 $, 10;
+$VERSION = substr q$Revision: 1.17 $, 10;
 
 sub Mksymlists {
     my(%spec) = @_;
@@ -69,6 +69,8 @@ sub _write_aix {
 
 sub _write_os2 {
     my($data) = @_;
+    require Config;
+    my $threaded = ($Config::Config{archname} =~ /-thread/ ? " threaded" : "");
 
     if (not $data->{DLBASE}) {
         ($data->{DLBASE} = $data->{NAME}) =~ s/.*:://;
@@ -79,6 +81,7 @@ sub _write_os2 {
     open(DEF,">$data->{FILE}.def")
         or croak("Can't create $data->{FILE}.def: $!\n");
     print DEF "LIBRARY '$data->{DLBASE}' INITINSTANCE TERMINSTANCE\n";
+    print DEF "DESCRIPTION 'Perl (v$]$threaded) module $data->{NAME} v$data->{VERSION}'\n";
     print DEF "CODE LOADONCALL\n";
     print DEF "DATA LOADONCALL NONSHARED MULTIPLE\n";
     print DEF "EXPORTS\n  ";
diff -pru perl5.004_64/lib/ExtUtils/MM_OS2.pm perl5.004_64-thr/lib/ExtUtils/MM_OS2.pm
--- perl5.004_64/lib/ExtUtils/MM_OS2.pm	Tue Nov 25 09:52:22 1997
+++ perl5.004_64-thr/lib/ExtUtils/MM_OS2.pm	Sat Apr  4 00:42:06 1998
@@ -29,7 +29,8 @@ $self->{BASEEXT}.def: Makefile.PL
      '", "DLBASE" => "',$self->{DLBASE},
      '", "DL_FUNCS" => ',neatvalue($funcs),
      ', "IMPORTS" => ',neatvalue($imports),
-     ', "DL_VARS" => ', neatvalue($vars), ');\'
+     ', "VERSION" => "',$self->{VERSION},
+     '", "DL_VARS" => ', neatvalue($vars), ');\'
 ');
     }
     join('',@m);
diff -pru perl5.004_64/os2/Changes perl5.004_64-thr/os2/Changes
--- perl5.004_64/os2/Changes	Wed Dec 17 06:15:30 1997
+++ perl5.004_64-thr/os2/Changes	Sat Apr  4 01:14:30 1998
@@ -166,3 +166,7 @@ after 5.004_03:
 
 after 5.004_53:
 	Minimal thread support added.  One needs to manually move pthread.h
+
+after 5.004_64:
+	Make DLL names different if thread-enabled.
+	Emit more informative internal DLL descriptions.
diff -pru perl5.004_64/os2/Makefile.SHs perl5.004_64-thr/os2/Makefile.SHs
--- perl5.004_64/os2/Makefile.SHs	Wed Dec 17 06:15:30 1997
+++ perl5.004_64-thr/os2/Makefile.SHs	Sat Apr  4 00:59:06 1998
@@ -6,8 +6,17 @@
 # Additional rules supported: perl_, aout_test, aout_install, use them
 # for a.out style perl (which may fork).
 
+perl_version="5.00${PATCHLEVEL}_$SUBVERSION"
+case "$archname" in
+ *-thread)	dll_post=_thr 
+		perl_version="${perl_version}-threaded";;
+ *)		dll_post='' ;;
+esac
+
 $spitshell >>Makefile <<!GROK!THIS!
 
+PERL_VERSION = $perl_version
+
 AOUT_OPTIMIZE = $optimize
 AOUT_CCCMD	= \$(CC) $aout_ccflags \$(AOUT_OPTIMIZE)
 AOUT_AR		= $aout_ar
@@ -22,13 +31,16 @@ AOUT_CLDFLAGS_DLL	= -Zexe -Zmt -Zcrtdll
 
 LD_OPT		= $optimize
 
+PERL_DLL_BASE	= perl$dll_post
+PERL_DLL	= \$(PERL_DLL_BASE)\$(DLSUFFIX)
+
 !GROK!THIS!
 
 $spitshell >>Makefile <<'!NO!SUBS!'
-$(LIBPERL): perl.imp perl.dll perl5.def
+$(LIBPERL): perl.imp $(PERL_DLL) perl5.def
 	emximp -o $(LIBPERL) perl.imp
 
-$(AOUT_LIBPERL_DLL): perl.imp perl.dll perl5.def
+$(AOUT_LIBPERL_DLL): perl.imp $(PERL_DLL) perl5.def
 	emximp -o $(AOUT_LIBPERL_DLL) perl.imp
 
 perl.imp: perl5.def
@@ -38,12 +50,12 @@ perl.imp: perl5.def
 	echo	'emx_malloc		emxlibcm	402	?' >> $@
 	echo	'emx_realloc		emxlibcm	403	?' >> $@
 
-perl.dll: $(obj) perl5.def perl$(OBJ_EXT)
+$(PERL_DLL): $(obj) perl5.def perl$(OBJ_EXT)
 	$(LD) $(LD_OPT) $(LDDLFLAGS) -o $@ perl$(OBJ_EXT) $(obj) $(libs) perl5.def
 
 perl5.def: perl.linkexp
-	echo "LIBRARY 'Perl' INITINSTANCE TERMINSTANCE"	> $@
-	echo DESCRIPTION "'Perl interpreter, export autogenerated'"	>>$@
+	echo "LIBRARY '$(PERL_DLL_BASE)' INITINSTANCE TERMINSTANCE"	> $@
+	echo DESCRIPTION "'Perl interpreter v$(PERL_VERSION), export autogenerated'"	>>$@
 	echo STACKSIZE 32768				>>$@
 	echo CODE LOADONCALL				>>$@
 	echo DATA LOADONCALL NONSHARED MULTIPLE		>>$@
@@ -68,7 +80,7 @@ perl.exports: perl.exp EXTERN.h perl.h
 		$(CC) -DEMBED  -E - | \
 		awk '{if ($$2 == "") print $$1}' | sort | uniq > $@
 
-perl.linkexp: perl.exports perl.map
+perl.linkexp: perl.exports perl.map  os2/os2.sym
 	cat perl.exports os2/os2.sym perl.map | sort | uniq -d | sed -e 's/\w\+/  "\0"/' > perl.linkexp
 
 # We link miniperl statically, since .DLL depends on $(DYNALOADER) 
