diff --git a/components/ideintf/ideexterntoolintf.pas b/components/ideintf/ideexterntoolintf.pas
index 4654265cbc..6f75497ec2 100644
--- a/components/ideintf/ideexterntoolintf.pas
+++ b/components/ideintf/ideexterntoolintf.pas
@@ -103,6 +103,7 @@ type
   TAbstractExternalTool = class;
 
   TMessageLineFlag = (
+    mlfStdErr,
     mlfLeftToken, // position is about left token, otherwise right token
     mlfFixed, // reason for the messages was resolved, e.g. quick fixed
     mlfHiddenByIDEDirective,
@@ -297,7 +298,7 @@ type
     procedure Init; virtual; // called after macros resolved, before starting thread (main thread)
     procedure InitReading; virtual; // called if process started, before first line (worker thread)
     procedure Done; virtual; // called after process stopped (worker thread)
-    procedure ReadLine(Line: string; OutputIndex: integer; var Handled: boolean); virtual; abstract; // (worker thread)
+    procedure ReadLine(Line: string; OutputIndex: integer; IsStdErr: boolean; var Handled: boolean); virtual; abstract; // (worker thread)
     function CreateMsgLine(OutputIndex: integer): TMessageLine; // (worker thread)
     procedure AddMsgLine(MsgLine: TMessageLine); virtual; // (worker thread)
     property Tool: TAbstractExternalTool read FTool;// set when added to a tool
@@ -360,8 +361,8 @@ type
 
   TDefaultParser = class(TExtToolParser)
   public
-    procedure ReadLine(Line: string; OutputIndex: integer; var Handled: boolean
-      ); override;
+    procedure ReadLine(Line: string; OutputIndex: integer; IsStdErr: boolean;
+      var Handled: boolean); override;
     class function DefaultSubTool: string; override;
     class function GetLocalizedParserName: string; override;
     class function Priority: integer; override;
@@ -997,7 +998,7 @@ end;
 { TDefaultParser }
 
 procedure TDefaultParser.ReadLine(Line: string; OutputIndex: integer;
-  var Handled: boolean);
+  IsStdErr: boolean; var Handled: boolean);
 var
   MsgLine: TMessageLine;
 begin
@@ -1006,6 +1007,8 @@ begin
   MsgLine:=CreateMsgLine(OutputIndex);
   MsgLine.Msg:=Line;
   MsgLine.Urgency:=mluImportant;
+  if IsStdErr then
+    MsgLine.Flags:=MsgLine.Flags+[mlfStdErr];
   AddMsgLine(MsgLine);
 end;
 
diff --git a/ide/etfpcmsgparser.pas b/ide/etfpcmsgparser.pas
index 297d26a635..c64c797c6d 100644
--- a/ide/etfpcmsgparser.pas
+++ b/ide/etfpcmsgparser.pas
@@ -166,6 +166,7 @@ type
     fLineToMsgID: TPatternToMsgIDs;
     fMissingFPCMsgItem: TFPCMsgItem;
     fMsgID: Integer; // current message id given by ReadLine (-vq)
+    fMsgIsStdErr: boolean;
     fMsgItemCantFindUnitUsedBy: TFPCMsgItem;
     fMsgItemCompilationAborted: TFPCMsgItem;
     fMsgItemErrorWhileCompilingResources: TFPCMsgItem;
@@ -193,6 +194,7 @@ type
     function CheckForWindresErrors(p: PChar): boolean;
     function CheckForLinkerErrors(p: PChar): boolean;
     function CheckForAssemblerErrors(p: PChar): boolean;
+    function CheckForUnspecificStdErr(p: PChar): boolean;
     function CreateMsgLine: TMessageLine;
     procedure AddLinkingMessages;
     procedure AddResourceMessages;
@@ -232,7 +234,8 @@ type
     procedure Init; override; // called after macros resolved, before starting thread (main thread)
     procedure InitReading; override; // called when process started, before first line (worker thread)
     procedure Done; override; // called after process stopped (worker thread)
-    procedure ReadLine(Line: string; OutputIndex: integer; var Handled: boolean); override;
+    procedure ReadLine(Line: string; OutputIndex: integer; IsStdErr: boolean;
+      var Handled: boolean); override;
     procedure AddMsgLine(MsgLine: TMessageLine); override;
     procedure ImproveMessages(aPhase: TExtToolParserSyncPhase); override;
     function GetFPCMsgIDPattern(MsgID: integer): string; override;
@@ -1549,6 +1552,19 @@ begin
   AddMsgLine(MsgLine);
 end;
 
+function TIDEFPCParser.CheckForUnspecificStdErr(p: PChar): boolean;
+var
+  MsgLine: TMessageLine;
+begin
+  if not fMsgIsStdErr then exit(false);
+  Result:=true;
+  MsgLine:=CreateMsgLine;
+  MsgLine.SubTool:=SubToolFPC;
+  MsgLine.Urgency:=mluError;
+  MsgLine.Msg:=p;
+  AddMsgLine(MsgLine);
+end;
+
 function TIDEFPCParser.CheckForInfos(p: PChar): boolean;
 
   function ReadFPCLogo(PatternItem: PPatternToMsgID;
@@ -1625,6 +1641,8 @@ function TIDEFPCParser.CreateMsgLine: TMessageLine;
 begin
   Result:=inherited CreateMsgLine(fOutputIndex);
   Result.MsgID:=fMsgID;
+  if fMsgIsStdErr then
+    Result.Flags:=Result.Flags+[mlfStdErr];
 end;
 
 procedure TIDEFPCParser.AddLinkingMessages;
@@ -2905,7 +2923,7 @@ begin
 end;
 
 procedure TIDEFPCParser.ReadLine(Line: string; OutputIndex: integer;
-  var Handled: boolean);
+  IsStdErr: boolean; var Handled: boolean);
 { returns true, if it is a compiler message
    Examples for freepascal compiler messages:
      Compiling <filename>
@@ -2927,6 +2945,7 @@ begin
   p:=PChar(Line);
   fOutputIndex:=OutputIndex;
   fMsgID:=0;
+  fMsgIsStdErr:=IsStdErr;
 
   // skip time [0.000]
   if (p^='[') and (p[1] in ['0'..'9']) then begin
@@ -2984,6 +3003,9 @@ begin
   // check for assembler errors
   if CheckForAssemblerErrors(p) then exit;
 
+  // last: check for unknown std error
+  if CheckForUnspecificStdErr(p) then exit;
+
   {$IFDEF VerboseFPCParser}
   debugln('TFPCParser.ReadLine UNKNOWN: ',Line);
   {$ENDIF}
diff --git a/ide/etmakemsgparser.pas b/ide/etmakemsgparser.pas
index bb496a6800..ea261cf2a1 100644
--- a/ide/etmakemsgparser.pas
+++ b/ide/etmakemsgparser.pas
@@ -58,7 +58,8 @@ type
     constructor Create(AOwner: TComponent); override;
     destructor Destroy; override;
     procedure InitReading; override;
-    procedure ReadLine(Line: string; OutputIndex: integer; var Handled: boolean); override;
+    procedure ReadLine(Line: string; OutputIndex: integer; IsStdErr: boolean;
+      var Handled: boolean); override;
     class function DefaultSubTool: string; override;
     class function Priority: integer; override;
   end;
@@ -245,7 +246,7 @@ begin
 end;
 
 procedure TIDEMakeParser.ReadLine(Line: string; OutputIndex: integer;
-  var Handled: boolean);
+  IsStdErr: boolean; var Handled: boolean);
 { returns true, if it is a make/gmake message
    Examples for make messages:
      make[1]: Entering directory `<filename>'
@@ -283,7 +284,13 @@ begin
 
     MsgLine:=CreateMsgLine(OutputIndex);
     MsgLine.SubTool:=SubToolMake;
-    MsgLine.Urgency:=mluVerbose;
+    if IsStdErr then
+    begin
+      MsgLine.Urgency:=mluImportant;
+      MsgLine.Flags:=MsgLine.Flags+[mlfStdErr];
+    end else begin
+      MsgLine.Urgency:=mluVerbose;
+    end;
     MsgLine.Msg:=Line;
 
     if p^='[' then
@@ -324,7 +331,12 @@ begin
 
     MsgLine:=CreateMsgLine(OutputIndex);
     MsgLine.SubTool:=SubToolMake;
-    MsgLine.Urgency:=mluVerbose;
+    if IsStdErr then begin
+      MsgLine.Urgency:=mluImportant;
+      MsgLine.Flags:=MsgLine.Flags+[mlfStdErr];
+    end else begin
+      MsgLine.Urgency:=mluVerbose;
+    end;
     MsgLine.Msg:=Line;
     AddMsgLine(MsgLine);
     exit;
@@ -345,7 +357,12 @@ begin
         Handled:=true;
         MsgLine:=CreateMsgLine(OutputIndex);
         MsgLine.SubTool:=SubToolMake;
-        MsgLine.Urgency:=mluVerbose;
+        if IsStdErr then begin
+          MsgLine.Urgency:=mluImportant;
+          MsgLine.Flags:=MsgLine.Flags+[mlfStdErr];
+        end else begin
+          MsgLine.Urgency:=mluVerbose;
+        end;
         MsgLine.Msg:=Line;
         AddMsgLine(MsgLine);
       end;
diff --git a/ide/exttools.pas b/ide/exttools.pas
index 0fdfd05f2c..64434bc464 100644
--- a/ide/exttools.pas
+++ b/ide/exttools.pas
@@ -306,7 +306,7 @@ var
   OldOutputCount: LongInt;
   OldMsgCount: LongInt;
   Parser: TExtToolParser;
-  NeedSynchronize: Boolean;
+  NeedSynchronize, IsStdErr: Boolean;
   MsgLine: TMessageLine;
   LineStr: String;
 begin
@@ -327,17 +327,20 @@ begin
     for Line:=OldOutputCount to WorkerOutput.Count-1 do begin
       Handled:=false;
       LineStr:=WorkerOutput[Line];
+      IsStdErr:=WorkerOutput.Objects[Line]<>nil;
       for i:=0 to ParserCount-1 do begin
         {$IFDEF VerboseExtToolAddOutputLines}
         DebuglnThreadLog(['TExternalTool.AddOutputLines ',DbgSName(Parsers[i]),' Line="',WorkerOutput[Line],'" READLINE ...']);
         {$ENDIF}
-        Parsers[i].ReadLine(LineStr,Line,Handled);
+        Parsers[i].ReadLine(LineStr,Line,IsStdErr,Handled);
         if Handled then break;
       end;
       if (not Handled) then begin
         MsgLine:=WorkerMessages.CreateLine(Line);
         MsgLine.Msg:=LineStr; // use raw output as default msg
         MsgLine.Urgency:=mluDebug;
+        if IsStdErr then
+          MsgLine.Flags:=MsgLine.Flags+[mlfStdErr];
         WorkerMessages.Add(MsgLine);
       end;
     end;
@@ -1420,7 +1423,8 @@ var
 var
   Buf: string;
 
-  function ReadInputPipe(aStream: TInputPipeStream; var LineBuf: string): boolean;
+  function ReadInputPipe(aStream: TInputPipeStream; var LineBuf: string;
+    IsStdErr: boolean): boolean;
   // true if some bytes have been read
   var
     Count: DWord;
@@ -1439,7 +1443,10 @@ var
     while i<=Count do begin
       if Buf[i] in [#10,#13] then begin
         LineBuf:=LineBuf+copy(Buf,StartPos,i-StartPos);
-        fLines.Add(LineBuf);
+        if IsStdErr then
+          fLines.AddObject(LineBuf,fLines)
+        else
+          fLines.Add(LineBuf);
         LineBuf:='';
         if (i<Count) and (Buf[i+1] in [#10,#13]) and (Buf[i]<>Buf[i+1])
         then
@@ -1544,11 +1551,11 @@ begin
       LastUpdate:=GetTickCount64;
       while (Tool<>nil) and (Tool.Stage=etsRunning) do begin
         if Tool.ReadStdOutBeforeErr then begin
-          HasOutput:=ReadInputPipe(Tool.Process.Output,OutputLine)
-                  or ReadInputPipe(Tool.Process.Stderr,StdErrLine);
+          HasOutput:=ReadInputPipe(Tool.Process.Output,OutputLine,false)
+                  or ReadInputPipe(Tool.Process.Stderr,StdErrLine,true);
         end else begin
-          HasOutput:=ReadInputPipe(Tool.Process.Stderr,StdErrLine)
-                  or ReadInputPipe(Tool.Process.Output,OutputLine);
+          HasOutput:=ReadInputPipe(Tool.Process.Stderr,StdErrLine,true)
+                  or ReadInputPipe(Tool.Process.Output,OutputLine,false);
         end;
         if (not HasOutput) then begin
           // no more pending output