ResStream: TResourceStream;
  {$IFDEF DARWIN}
  HTTPClient: TFPHttpClient;
  {$ENDIF}
begin
  // What's the current running groff version?
  {$IFDEF WINDOWS}
  if RunCommand('cmd', ['/c', 'troff --version'], GroffOutputVersion) then
  if RunCommand('cmd', ['/c', 'troff --version'], GroffOutputVersion, [], swoHIDE) then
  {$ELSE}
  if RunCommand('/bin/sh', ['-c', 'troff --version'], GroffOutputVersion) then
  if RunCommand('/bin/sh', ['-c', 'troff --version'], GroffOutputVersion, [], swoHIDE) then
  {$ENDIF}
  begin
    edtGroffInstalledVersion.Text := GroffOutputVersion;
    if pos('GNU', GroffOutputVersion) = 0 then
       ShowMessage('groffstudio thinks that your installed version of troff is not GNU troff.' + LineEnding +
       'If this is correct, you are advised to fix this before continuing.' + LineEnding +
       'If it is an error, please tell me so I can improve this detection.');

  BuildWindow := TBuildStatusWindow.Create(Application);
  BuildWindow.Show;

  // Build the parameters:
  buildOpts := 'groff';

  // - Macro:
  if cmbMacro.SelText <> '' then buildOpts := buildOpts + ' -' + cmbMacro.SelText;
  if LeftStr(cmbMacro.Text, 1) = 'm' then buildOpts := buildOpts + ' -' + cmbMacro.Text;

  // - Enforce UTF-8:
  buildOpts := buildOpts + ' -Kutf8';

  // - Preprocessors:
  if chkBoxPreprocessors.Checked[0] then   buildOpts := buildOpts + ' -chem';
  if chkBoxPreprocessors.Checked[1] then   buildOpts := buildOpts + ' -eqn';