These scripts are run by miniperl in perl-cross,
and have the right @INC set up for them externally.

The second chunk in installperl add -Dsoname support.

--- a/installman
+++ b/installman
@@ -1,8 +1,6 @@
 #!./perl -w
 
 BEGIN {
-    @INC = qw(lib);
-
     # This needs to be at BEGIN time, before any use of Config
     # install_lib itself loads and imports Config into main::
     require './install_lib.pl';
--- a/installperl
+++ b/installperl
@@ -2,8 +2,6 @@
 
 BEGIN {
     chdir '..' if !-d 'lib' and -d '../lib';
-    @INC = 'lib';
-    $ENV{PERL5LIB} = 'lib';
 
     # This needs to be at BEGIN time, before any use of Config
     # install_lib itself loads and imports Config into main::
@@ -183,6 +181,7 @@
 
 # Fetch some frequently-used items from %Config
 my $installbin = "$opts{destdir}$Config{installbin}";
+my $installlib = "$opts{destdir}$Config{installlib}";
 my $installscript = "$opts{destdir}$Config{installscript}";
 my $installprivlib = "$opts{destdir}$Config{installprivlib}";
 my $installarchlib = "$opts{destdir}$Config{installarchlib}";
@@ -339,7 +340,8 @@
     @corefiles = <*.h>;
 } else {
     # [als] hard-coded 'libperl' name... not good!
-    @corefiles = <*.h libperl*.* perl*$Config{lib_ext}>;
+    @corefiles = <*.h perl*$Config{lib_ext}>;
+    push(@corefiles, $Config{libperl}) if $Config{useshrplib} && !$Config{soname};
 
     # AIX needs perl.exp installed as well.
     push(@corefiles,'perl.exp') if $^O eq 'aix';
@@ -366,6 +366,29 @@
 	chmod($NON_SO_MODE, $dest) foreach @corefiles;
 }
 
+if($Config{useshrplib} && $Config{soname}) {
+    my $libperl = $Config{libperl};
+    my $soname = $Config{soname};
+    mkpath($installlib);
+    if (copy_if_diff($libperl, "$installlib/$libperl")) {
+        strip("-S", "$installlib/$libperl");
+        chmod(0555, "$installlib/$libperl");
+
+        # Normally this should be done by ldconfig.
+        safe_unlink("$installlib/$soname") unless $soname eq $libperl;
+        safe_unlink("$installlib/libperl.so") unless $soname eq 'libperl.so';
+        symlink($libperl, "$installlib/$soname") unless $soname eq $libperl;
+        symlink($libperl, "$installlib/libperl.so") unless $soname eq 'libperl.so';
+        # using $so here instead of .so hardly makes any sense,
+        # all systems supporting SONAME have $so=.so
+
+        # Backward compatibility: provide a symlink where people expect it
+        safe_unlink("$installarchlib/CORE/libperl.so");
+        symlink("$Config{installlib}/$libperl", "$installarchlib/CORE/libperl.so");
+        #        ^ without destdir here!
+    }
+}
+
 # Install main perl executables
 # Make links to ordinary names if installbin directory isn't current directory.