diff --git a/cMake/FindOCC.cmake b/cMake/FindOCC.cmake
index 48e5c98750..32078cf2de 100644
--- a/cMake/FindOCC.cmake
+++ b/cMake/FindOCC.cmake
@@ -160,11 +160,10 @@ if(OCC_FOUND)
     TKService
     TKV3d
   )
-  if(OCC_VERSION_STRING VERSION_LESS 6.7.3)
-    list(APPEND OCC_OCAF_LIBRARIES TKAdvTools)
-  elseif(NOT OCC_VERSION_STRING VERSION_LESS 7.5.0)
+
+  if(NOT OCC_VERSION_STRING VERSION_LESS 7.5.0)
     list(APPEND OCC_OCAF_LIBRARIES TKRWMesh)
-  endif(OCC_VERSION_STRING VERSION_LESS 6.7.3)
+  endif(NOT OCC_VERSION_STRING VERSION_LESS 7.5.0)
   message(STATUS "-- Found OCE/OpenCASCADE version: ${OCC_VERSION_STRING}")
   message(STATUS "-- OCE/OpenCASCADE include directory: ${OCC_INCLUDE_DIR}")
   message(STATUS "-- OCE/OpenCASCADE shared libraries directory: ${OCC_LIBRARY_DIR}")
diff --git a/src/Mod/Import/App/dxf/dxf.h b/src/Mod/Import/App/dxf/dxf.h
index 8ab4d3b6d4..43bd41aa38 100644
--- a/src/Mod/Import/App/dxf/dxf.h
+++ b/src/Mod/Import/App/dxf/dxf.h
@@ -21,10 +21,6 @@
 #include <Mod/Import/ImportGlobal.h>
 
 
-//Following is required to be defined on Ubuntu with OCC 6.3.1
-#ifndef HAVE_IOSTREAM
-#define HAVE_IOSTREAM
-#endif
 
 typedef int ColorIndex_t; // DXF color index
 
diff --git a/src/Mod/Part/App/BRepOffsetAPI_MakePipeShellPy.xml b/src/Mod/Part/App/BRepOffsetAPI_MakePipeShellPy.xml
index e2dd1fd641..046cbc7bc2 100644
--- a/src/Mod/Part/App/BRepOffsetAPI_MakePipeShellPy.xml
+++ b/src/Mod/Part/App/BRepOffsetAPI_MakePipeShellPy.xml
@@ -63,10 +63,6 @@
 					For each Point of the Spine P, an Point Q is evalued on AuxiliarySpine.
 					If CurvilinearEquivalence=True Q split AuxiliarySpine with the same length ratio than P split Spine.
 
-					* OCC before 6.7
-					TypeOfContact = bool
-					True = keep Contact
-
 					* OCC >= 6.7
 					TypeOfContact = long
 					0: No contact
diff --git a/src/Mod/Part/BOPTools/JoinAPI.py b/src/Mod/Part/BOPTools/JoinAPI.py
index b4a77cbf0c..2fb8bb151a 100644
--- a/src/Mod/Part/BOPTools/JoinAPI.py
+++ b/src/Mod/Part/BOPTools/JoinAPI.py
@@ -27,7 +27,6 @@ __doc__ = "JoinFeatures functions that operate on shapes."
 
 import Part
 from . import ShapeMerge
-from . import generalFuseIsAvailable
 from .GeneralFuseResult import GeneralFuseResult
 from .Utils import compoundLeaves
 
@@ -76,12 +75,6 @@ def connect(list_of_shapes, tolerance = 0.0):
     if len(list_of_shapes) < 2:
         return Part.makeCompound(list_of_shapes)
 
-    if not generalFuseIsAvailable(): #fallback to legacy
-        result = list_of_shapes[0]
-        for i in range(1, len(list_of_shapes)):
-            result = connect_legacy(result, list_of_shapes[i], tolerance)
-        return result
-
     pieces, map = list_of_shapes[0].generalFuse(list_of_shapes[1:], tolerance)
     ao = GeneralFuseResult(list_of_shapes, (pieces, map))
     ao.splitAggregates()
diff --git a/src/Mod/Part/BOPTools/__init__.py b/src/Mod/Part/BOPTools/__init__.py
index bd66daa95a..2eb2dd23f6 100644
--- a/src/Mod/Part/BOPTools/__init__.py
+++ b/src/Mod/Part/BOPTools/__init__.py
@@ -62,16 +62,3 @@ def addCommands():
     JoinFeatures.addCommands()
     SplitFeatures.addCommands()
 
-def generalFuseIsAvailable():
-    """generalFuseIsAvailable(): returns True if FreeCAD's Part.Shape.generalFuse is functional.
-    True if Part.OCC_VERSION >= 7.0.0."""
-    import Part
-    if not hasattr(Part, "OCC_VERSION"):
-        return False
-    else:
-        ver_string = Part.OCC_VERSION
-        import re
-        match = re.match(r"([0-9]+)\.([0-9]+)\.([0-9]+)",ver_string)
-        major,minor,rev = match.groups()
-        major = int(major); minor = int(minor); rev = int(rev)
-        return (major,minor,rev)>=(7,0,0)