Index: cvs/install.pl
--- cvs/install.pl.orig	2008-05-17 16:22:38 +0200
+++ cvs/install.pl	2008-05-18 12:06:39 +0200
@@ -112,11 +112,11 @@
 }
 
 # prior installation may not have supported .makepp/*.mk files
--r "$datadir/FileInfo_makepp.pm" and
-  (stat "$datadir/FileInfo_makepp.pm")[9] < 1102710870 || # check-in time
+-r "$ENV{DESTDIR}$datadir/FileInfo_makepp.pm" and
+  (stat "$ENV{DESTDIR}$datadir/FileInfo_makepp.pm")[9] < 1102710870 || # check-in time
   do {
     my $found;
-    open F, "$datadir/FileInfo_makepp.pm";
+    open F, "$ENV{DESTDIR}$datadir/FileInfo_makepp.pm";
     while( <F> ) {
       $found = 1, last if /build_info_subdir.+\.mk/;
     }
@@ -162,13 +162,13 @@
 @sig_num{split ' ', $Config{sig_name}} = split ' ', $Config{sig_num};
 $USR1 = $sig_num{USR1}; $USR1 = $USR1; 	# suppress used-only-once warning
 
-substitute_file( $_, $bindir, 0755, 1 ) for
+substitute_file( $_, "$ENV{DESTDIR}$bindir", 0755, 1 ) for
   qw(makepp makeppbuiltin makeppclean makeppgraph makeppinfo makepplog makepp_build_cache_control);
 
-substitute_file( $_, $datadir, 0644 ) for
+substitute_file( $_, "$ENV{DESTDIR}$datadir", 0644 ) for
   qw(recursive_makepp FileInfo_makepp.pm BuildCacheControl.pm);
 
-make_dir("$datadir/$_") for
+make_dir("$ENV{DESTDIR}$datadir/$_") for
   qw(ActionParser BuildCheck CommandParser Scanner Signature);
 foreach $module (qw(AutomakeFixer BuildCache FileInfo Glob MakeEvent
 		    Makecmds Makefile Makesubs Rule TextSubs Utils
@@ -189,13 +189,13 @@
 		    Signature Signature/c_compilation_md5 Signature/md5
 		    Signature/shared_object Signature/verilog_simulation_md5
 		    Signature/verilog_synthesis_md5)) {
-  copy("$module.pm", "$datadir/$module.pm");
-  chmod 0644, "$datadir/$module.pm";
+  copy("$module.pm", "$ENV{DESTDIR}$datadir/$module.pm");
+  chmod 0644, "$ENV{DESTDIR}$datadir/$module.pm";
 }
 
 foreach $include (qw(makepp_builtin_rules makepp_default_makefile)) {
-  copy("$include.mk", "$datadir/$include.mk");
-  chmod 0644, "$datadir/$include.mk";
+  copy("$include.mk", "$ENV{DESTDIR}$datadir/$include.mk");
+  chmod 0644, "$ENV{DESTDIR}$datadir/$include.mk";
 }
 
 #
@@ -214,11 +214,11 @@
     my $manfile = $file;
     $manfile =~ s/\.pod$/.1/;   # Get the name of the man file.
     $manfile =~ s@^pod/@@;
-    system("pod2man $file > $mandir/man1/$manfile 2>/dev/null");
+    system("pod2man $file > $ENV{DESTDIR}$mandir/man1/$manfile 2>/dev/null");
                                 # Ignore stderr because older versions of
                                 # pod2man (e.g., perl 5.006) don't understand
                                 # =head3.
-    chmod 0644, "$mandir/man1/$manfile";
+    chmod 0644, "$ENV{DESTDIR}$mandir/man1/$manfile";
   }
 }
 
@@ -387,8 +387,8 @@
       $nav .= join '<br />', map $link{$_}, @links;
     }
     $nav .= '</td></tr></table>';
-    open my $outfile, ">$htmldir_val/$_" or die "can't create `$htmldir_val/$_'--$!";
-    chmod 0644, "$htmldir_val/$_";
+    open my $outfile, ">$ENV{DESTDIR}$htmldir_val/$_" or die "can't create `$htmldir_val/$_'--$!";
+    chmod 0644, "$ENV{DESTDIR}$htmldir_val/$_";
     s/\.html$//;
     my $title = (s/^makepp(?:_|$)// ? 'Makepp ' : '') . $alias{$_ || 'makepp'};
     my $index;
@@ -540,11 +540,11 @@
   unlink $tmp;
 
   for( qw'google.png makepp.gif makepp.css pre.png sflogo.png url.png' ) {
-    copy $_, "$htmldir_val/$_";
-    chmod 0644, "$htmldir_val/$_";
+    copy $_, "$ENV{DESTDIR}$htmldir_val/$_";
+    chmod 0644, "$ENV{DESTDIR}$htmldir_val/$_";
   }
 
-  symlink 'makepp.html', "$htmldir_val/index.html";
+  symlink 'makepp.html', "$ENV{DESTDIR}$htmldir_val/index.html";
 }
 
 #
@@ -637,6 +637,7 @@
 }
 
 sub read_with_prompt {
+  return undef;
   local $| = 1;			# Enable autoflush on STDOUT.
 
   print @_;			# Print the prompt.