4 files changed, 19 insertions, 14 deletions
diff --git a/perl/Git/SVN.pm b/perl/Git/SVN.pm
index 8e4af7153..afa562c8b 100644
--- a/perl/Git/SVN.pm
+++ b/perl/Git/SVN.pm
@@ -9,10 +9,8 @@ use vars qw/$_no_metadata
 	    $_use_log_author $_add_author_from $_localtime/;
 use Carp qw/croak/;
 use File::Path qw/mkpath/;
-use File::Copy qw/copy/;
 use IPC::Open3;
 use Memoize;  # core since 5.8.0, Jul 2002
-use Memoize::Storable;
 use POSIX qw(:signal_h);
 
 use Git qw(
@@ -32,11 +30,7 @@ use Git::SVN::Utils qw(
 	add_path_to_url
 );
 
-my $can_use_yaml;
-BEGIN {
-	$can_use_yaml = eval { require Git::SVN::Memoize::YAML; 1};
-}
-
+my $memo_backend;
 our $_follow_parent  = 1;
 our $_minimize_url   = 'unset';
 our $default_repo_id = 'svn';
@@ -1578,7 +1572,16 @@ sub tie_for_persistent_memoization {
 	my $hash = shift;
 	my $path = shift;
 
-	if ($can_use_yaml) {
+	unless ($memo_backend) {
+		if (eval { require Git::SVN::Memoize::YAML; 1}) {
+			$memo_backend = 1;
+		} else {
+			require Memoize::Storable;
+			$memo_backend = -1;
+		}
+	}
+
+	if ($memo_backend > 0) {
 		tie %$hash => 'Git::SVN::Memoize::YAML', "$path.yaml";
 	} else {
 		tie %$hash => 'Memoize::Storable', "$path.db", 'nstore';
@@ -2188,8 +2191,9 @@ sub rev_map_set {
 	# both of these options make our .rev_db file very, very important
 	# and we can't afford to lose it because rebuild() won't work
 	if ($self->use_svm_props || $self->no_metadata) {
+		require File::Copy;
 		$sync = 1;
-		copy($db, $db_lock) or die "rev_map_set(@_): ",
+		File::Copy::copy($db, $db_lock) or die "rev_map_set(@_): ",
 					   "Failed to copy: ",
 					   "$db => $db_lock ($!)\n";
 	} else {
diff --git a/perl/Git/SVN/Editor.pm b/perl/Git/SVN/Editor.pm
index 4088f13e7..c50176eec 100644
--- a/perl/Git/SVN/Editor.pm
+++ b/perl/Git/SVN/Editor.pm
@@ -5,7 +5,6 @@ use warnings;
 use SVN::Core;
 use SVN::Delta;
 use Carp qw/croak/;
-use IO::File;
 use Git qw/command command_oneline command_noisy command_output_pipe
            command_input_pipe command_close_pipe
            command_bidi_pipe command_close_bidi_pipe/;
@@ -586,7 +585,7 @@ The interface will change as git-svn evolves.
 =head1 DEPENDENCIES
 
 Subversion perl bindings,
-the core L<Carp> and L<IO::File> modules,
+the core L<Carp> module,
 and git's L<Git> helper module.
 
 C<Git::SVN::Editor> has not been tested using callers other than
diff --git a/perl/Git/SVN/Fetcher.pm b/perl/Git/SVN/Fetcher.pm
index 10edb2773..6b9c6e013 100644
--- a/perl/Git/SVN/Fetcher.pm
+++ b/perl/Git/SVN/Fetcher.pm
@@ -7,7 +7,6 @@ use warnings;
 use SVN::Delta;
 use Carp qw/croak/;
 use File::Basename qw/dirname/;
-use IO::File qw//;
 use Git qw/command command_oneline command_noisy command_output_pipe
            command_input_pipe command_close_pipe
            command_bidi_pipe command_close_bidi_pipe/;
@@ -600,7 +599,7 @@ developing git-svn.
 =head1 DEPENDENCIES
 
 L<SVN::Delta> from the Subversion perl bindings,
-the core L<Carp>, L<File::Basename>, and L<IO::File> modules,
+the core L<Carp> and L<File::Basename> modules,
 and git's L<Git> helper module.
 
 C<Git::SVN::Fetcher> has not been tested using callers other than
diff --git a/perl/Git/SVN/Ra.pm b/perl/Git/SVN/Ra.pm
index 622535e21..cf36b9d3c 100644
--- a/perl/Git/SVN/Ra.pm
+++ b/perl/Git/SVN/Ra.pm
@@ -3,7 +3,6 @@ use vars qw/@ISA $config_dir $_ignore_refs_regex $_log_window_size/;
 use strict;
 use warnings;
 use Memoize;
-use SVN::Client;
 use Git::SVN::Utils qw(
 	canonicalize_url
 	canonicalize_path
@@ -42,6 +41,7 @@ END {
 }
 
 sub _auth_providers () {
+	require SVN::Client;
 	my @rv = (
 	  SVN::Client::get_simple_provider(),
 	  SVN::Client::get_ssl_server_trust_file_provider(),
@@ -247,7 +247,10 @@ sub get_log {
 	$ret;
 }
 
+# uncommon, only for ancient SVN (<= 1.4.2)
 sub trees_match {
+	require IO::File;
+	require SVN::Client;
 	my ($self, $url1, $rev1, $url2, $rev2) = @_;
 	my $ctx = SVN::Client->new(auth => _auth_providers);
 	my $out = IO::File->new_tmpfile;