diff --git a/vtk.spec b/vtk.spec
index d667f8a..2137f7b 100644
--- a/vtk.spec
+++ b/vtk.spec
@@ -54,6 +54,9 @@ Patch2: vtk-gcc10.patch
 # Qt 5.15 support
 # https://gitlab.kitware.com/vtk/vtk/-/issues/18005
 Patch3: vtk-qt5.15.patch
+# Temporary patch for building against freetype-2.10.4, which removed FT_CALLBACK_DEF,
+# but was later re-added in https://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=b0667d2d36fb134d48030b2a560eaaa37810d6ba
+Patch4: vtk_freetype-2.10.4.patch
 
 URL: http://vtk.org/
 
@@ -494,6 +497,7 @@ programming languages.
 %patch1 -p1 -b .proj6
 %patch2 -p1 -b .gcc10
 %patch3 -p1 -b .qt5.15
+%patch4 -p1 -b .freetype
 # Remove included thirdparty sources just to be sure
 # TODO - diy2 - not yet packaged
 # TODO - exodusII - not yet packaged
diff --git a/vtk_freetype-2.10.4.patch b/vtk_freetype-2.10.4.patch
new file mode 100644
index 0000000..d8469a5
--- /dev/null
+++ b/vtk_freetype-2.10.4.patch
@@ -0,0 +1,34 @@
+diff -rupN VTK-8.2.0/Rendering/FreeType/vtkFreeTypeTools.cxx VTK-8.2.0-new/Rendering/FreeType/vtkFreeTypeTools.cxx
+--- VTK-8.2.0/Rendering/FreeType/vtkFreeTypeTools.cxx	2019-01-30 18:15:13.000000000 +0100
++++ VTK-8.2.0-new/Rendering/FreeType/vtkFreeTypeTools.cxx	2020-11-06 00:21:07.259999338 +0100
+@@ -387,6 +387,13 @@ FTC_CMapCache* vtkFreeTypeTools::GetCMap
+ }
+ 
+ //----------------------------------------------------------------------------
++#ifndef FT_CALLBACK_DEF
++#ifdef __cplusplus
++#define FT_CALLBACK_DEF( x )  extern "C"  x
++#else
++#define FT_CALLBACK_DEF( x )  static  x
++#endif
++#endif /* FT_CALLBACK_DEF */
+ FT_CALLBACK_DEF(FT_Error)
+ vtkFreeTypeToolsFaceRequester(FTC_FaceID face_id,
+                               FT_Library lib,
+diff -rupN VTK-8.2.0/Rendering/FreeTypeFontConfig/vtkFontConfigFreeTypeTools.cxx VTK-8.2.0-new/Rendering/FreeTypeFontConfig/vtkFontConfigFreeTypeTools.cxx
+--- VTK-8.2.0/Rendering/FreeTypeFontConfig/vtkFontConfigFreeTypeTools.cxx	2019-01-30 18:15:13.000000000 +0100
++++ VTK-8.2.0-new/Rendering/FreeTypeFontConfig/vtkFontConfigFreeTypeTools.cxx	2020-11-06 00:21:25.588991839 +0100
+@@ -29,6 +29,13 @@ vtkStandardNewMacro(vtkFontConfigFreeTyp
+ namespace
+ {
+ // The FreeType face requester callback:
++#ifndef FT_CALLBACK_DEF
++#ifdef __cplusplus
++#define FT_CALLBACK_DEF( x )  extern "C"  x
++#else
++#define FT_CALLBACK_DEF( x )  static  x
++#endif
++#endif /* FT_CALLBACK_DEF */
+ FT_CALLBACK_DEF(FT_Error)
+ vtkFontConfigFreeTypeToolsFaceRequester(FTC_FaceID face_id,
+                                         FT_Library lib,