Index: CHANGES.txt
==================================================================
--- CHANGES.txt
+++ CHANGES.txt
@@ -1,7 +1,9 @@
-Version [next]
+Version 0.12.0
+2022-03-14
 
+[Feature] If the installed version of troff is not detected as groff, a warning is displayed.
 [Changed] On platforms which probably use a package manager (currently, Linux and BSDs), the "update check" checkbox is disabled and the related libraries are not referenced.
 [Improved] When exiting groffstudio, the Save function from the "save" button is reused.
 [Changed] Less capital letters.
 [Improved] groffstudio opens on the primary screen now.
 

Index: src/groffstudio.lpi
==================================================================
--- src/groffstudio.lpi
+++ src/groffstudio.lpi
@@ -20,12 +20,11 @@
       </Resources>
     </General>
     <VersionInfo>
       <UseVersionInfo Value="True"/>
       <AutoIncrementBuild Value="True"/>
-      <MinorVersionNr Value="11"/>
-      <BuildNr Value="1"/>
+      <MinorVersionNr Value="12"/>
       <Attributes pvaPreRelease="True"/>
       <StringTable ProductName="groffstudio"/>
     </VersionInfo>
     <BuildModes>
       <Item Name="Default" Default="True"/>

Index: src/unit1.pas
==================================================================
--- src/unit1.pas
+++ src/unit1.pas
@@ -148,10 +148,14 @@
 begin
   // What's the current running groff version?
   if RunCommand('troff', ['--version'], GroffOutputVersion) then
   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.');
     hasGroff := True;
   end else begin
     edtGroffInstalledVersion.Text := 'n/a';
     hasGroff := False;
     lblTroffCommandNotFound.Visible := True;