+use Config;
+
+my $pl = $Config{perl_patchlevel};
+my $desc = $Config{git_describe};
+for ($pl, $desc) {
+ $_ = undef unless defined and length;
+}
+
+my @DEFINES;
+my %macro;
+
+print "Checking if this is an official release of perl... ";
+my $is_release = ("$]" < 5.011) ? (defined($pl) || defined($desc) ? 0 : 1)
+ : (defined($desc) ? 0 : 1);
+push @DEFINES, "-DSU_RELEASE=$is_release";
+print $is_release ? "yes\n" : "no\n";
+
+my $is_gcc_34 = 0;
+print "Checking if this is gcc 3.4 on Windows trying to link against an import library... ";
+if ($^O eq 'MSWin32' and not grep /^LD[A-Z]*=/, @ARGV) {
+ my ($libperl, $gccversion) = map $_ || '', @Config{qw<libperl gccversion>};
+ if ($gccversion =~ /^3\.4\.[0-9]+/ and $libperl =~ s/\.lib$//) {
+ $is_gcc_34 = 1;
+ my ($lddlflags, $ldflags) = @Config{qw<lddlflags ldflags>};
+ $_ ||= '', s/-L(?:".*?"|\S+)//g for $lddlflags, $ldflags;
+ $libperl = "-l$libperl";
+ my $libdirs = join ' ',
+ map { s/(?<!\\)((?:\\\\)*")/\\$1/g; qq[-L"$_"] }
+ @Config{qw<bin sitebin>};
+ $macro{LDDLFLAGS} = "$lddlflags $libdirs $libperl";
+ $macro{LDFLAGS} = "$ldflags $libdirs $libperl";
+ eval <<' MY_SECTION';
+ package MY;
+ sub dynamic_lib {
+ my $self = shift;
+ my $inherited = $self->SUPER::dynamic_lib(@_);
+ $inherited =~ s/"?\$\(PERL_ARCHIVE\)"?//g;
+ return $inherited;
+ }
+ MY_SECTION
+ die $@ if $@;
+ }
+}
+print $is_gcc_34 ? "yes\n" : "no\n";
+
+# Threads, Windows and 5.8.x don't seem to be best friends
+if ($^O eq 'MSWin32' && "$]" < 5.009) {
+ push @DEFINES, '-DXSH_MULTIPLICITY=0';
+}
+
+@DEFINES = (DEFINE => join ' ', @DEFINES) if @DEFINES;
+%macro = (macro => { %macro }) if %macro; # Beware of the cycle
+