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Yet another !surprise! from this newfangled string encoding auto-management.

I launched my engine compiled in fpc 3.0.4 on the mammoth coprolite I call my file server:

Chentrah version 0.21.3847 for Win32-i386, 
  compiled at 12:21:52 on 2018/01/28 using Free Pascal 3.0.4.
  (developer mode on)
Operating System: Wine 1.3.28 / Ubuntu 11.10
User name: cheb
CPU Phenom II X2 550
  x2 logical cores
  level 2 cache: 512 Kbytes, line size 64 bytes
  TSC invariancy: yes
  TSC frequency: 3.11 GHz)

Lo and behold it crashed with "Failed to load "GL_ARB_framebuffer_object"".
Scratching the bone between my ears, I checked the extension string. Nope, the extension was there. So why?

Unearthed an old function naively assuming that String = AnsiString:

function glext_ExtensionSupported(const extension: String; const searchIn: String): Boolean;
var
  extensions: PAnsiChar;
  start: PAnsiChar;
  where, terminator: PAnsiChar;
begin

  if (Pos(' ', extension) <> 0) or (extension = '') then
  begin
    Result := FALSE;
    Exit;
  end;

  if searchIn = '' then extensions := PAnsiChar(glGetString(GL_EXTENSIONS))
  else extensions := PAnsiChar(searchIn);
  start := extensions;
  while TRUE do
  begin
    where := StrPos(start, PAnsiChar(extension));
    if where = nil then Break;
    terminator := Pointer(PtrUInt(where) + Length(extension));
    if (where = start) or (PAnsiChar(PtrUInt(where) - 1)^ = ' ') then
    begin
      if (terminator^ = ' ') or (terminator^ = #0) then
      begin
        Result := TRUE;
        Exit;
      end;
    end;
    start := terminator;
  end;
  Result := FALSE;

end;

Corrected it to AnsiString and my engine started up, proving there is life on GeForce 7025.

But!
The wrong version was working fine in real Windows.
I can only assume that that fossilized wine did not have some mechanism the auto-recoding of the FPC RTL relies on.
That's another thing to watch out for, I suppose.