Index: CHANGES.txt
==================================================================
--- CHANGES.txt
+++ CHANGES.txt
@@ -1,9 +1,11 @@
-Version [next]
+Version 0.14.1
+2025-01-02
 
 [Changed] New icon, slightly less awful.
 [Bugfix] On macOS, groffstudio printed debug output where it shouldn't.
+[Bugfix] Preprocessors did not quite work as well as they should have.
 
 -------------------------------
 
 Version 0.14.0
 2024-05-02

Index: src/unit1.pas
==================================================================
--- src/unit1.pas
+++ src/unit1.pas
@@ -394,10 +394,11 @@
 
 procedure TMainForm.btnBuildClick(Sender: TObject);
 var
   buildSuccess: boolean;
   buildOpts: string;
+  preproc: string;
   logFileName: string = '';
   outputFileName: string;
 begin
   // Reset status display:
   MainStatusBar.Panels[1].Text := '';
@@ -413,16 +414,17 @@
 
   // - Enforce UTF-8:
   buildOpts := buildOpts + ' -Kutf8';
 
   // - Preprocessors:
-  if chkBoxPreprocessors.Checked[0] then  buildOpts := buildOpts + ' -chem';
-  if chkBoxPreprocessors.Checked[1] then  buildOpts := buildOpts + ' -eqn';
-  if chkBoxPreprocessors.Checked[2] then  buildOpts := buildOpts + ' -grn';
-  if chkBoxPreprocessors.Checked[3] then  buildOpts := buildOpts + ' -pic';
-  if chkBoxPreprocessors.Checked[4] then  buildOpts := buildOpts + ' -refer';
-  if chkBoxPreprocessors.Checked[5] then  buildOpts := buildOpts + ' -tbl';
+  if chkBoxPreprocessors.Checked[0] then  preproc := preproc + 'chem | ';
+
+  if chkBoxPreprocessors.Checked[1] then  buildOpts := buildOpts + ' -e';   // eqn
+  if chkBoxPreprocessors.Checked[2] then  buildOpts := buildOpts + ' -g';   // grn
+  if chkBoxPreprocessors.Checked[3] then  buildOpts := buildOpts + ' -p';   // pic
+  if chkBoxPreprocessors.Checked[4] then  buildOpts := buildOpts + ' -R';   // refer
+  if chkBoxPreprocessors.Checked[5] then  buildOpts := buildOpts + ' -t';   // tbl
 
   if chkBoxExtras.Checked[0] then  buildOpts := buildOpts + ' -mhdtbl';
 
   // - PDF-specifics:
 {$IFNDEF WINDOWS}
@@ -446,10 +448,11 @@
 
   // - Log file:
   if chkLogFile.Checked then logFileName := currentGroffFilePath + '.log';
 
   // Build:
+  buildOpts := preproc + buildOpts;
   buildSuccess := BuildWindow.BuildDocument(buildOpts, logFileName);
 
 {$IFDEF WINDOWS}
   if buildSuccess and hasGhostscript and rdPdf.Checked then
 {$ELSE}