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sub configure {
    $ENV{'CC'} # If a compiler is not specified on the command line then
      or $ENV{'CC'} = $Config{'cc'}; # use the one with which perl was built

    system("./configure") == 0 or
      die "Error in configuring the Authen::PAM module.\n";

    # returns a reference to anonymous hash which is then interpreted as
    # additional options to the WriteMakeFile
    $options = require "pam.cfg";

    if ( $Config{'osname'} eq 'solaris' && $Config{'osvers'} eq '2.6') {
      print "Adding a workaround for a bug in the Solaris 2.6 pam library\n";
      ${$options}{'DEFINE'} .= ' -DSTATIC_CONV_FUNC ';
    }

    foreach (@ARGV) {
      if (/^-D.+/) {
	print "Adding a definition '$_' from the command line\n";
	$options->{DEFINE} .= " $_ " ;