diff --git a/math/pdal/files/patch-vendor_kazhdan_Ply.h b/math/pdal/files/patch-vendor_kazhdan_Ply.h
new file mode 100644
index 000000000000..2ec2a38292d4
--- /dev/null
+++ b/math/pdal/files/patch-vendor_kazhdan_Ply.h
@@ -0,0 +1,20 @@
+--- vendor/kazhdan/Ply.h.orig	2024-06-29 01:37:43 UTC
++++ vendor/kazhdan/Ply.h
+@@ -317,7 +317,7 @@ class PlyOrientedVertex (public)
+ 	PlyOrientedVertex( void ) { ; }
+ 	PlyOrientedVertex( Point3D< Real > p , Point3D< Real > n ) : point(p) , normal(n) { ; }
+   	PlyOrientedVertex operator + ( PlyOrientedVertex p ) const { return PlyOrientedVertex( point+p.point , normal+p.normal ); }
+-	PlyOrientedVertex operator - ( PlyOrientedVertex p ) const { return PlyOrientedVertex( point-p.value , normal-p.normal ); }
++	PlyOrientedVertex operator - ( PlyOrientedVertex p ) const { return PlyOrientedVertex( point-p.point , normal-p.normal ); }
+ 	template< class _Real > PlyOrientedVertex operator * ( _Real s ) const { return PlyOrientedVertex( point*s , normal*s ); }
+ 	template< class _Real > PlyOrientedVertex operator / ( _Real s ) const { return PlyOrientedVertex( point/s , normal/s ); }
+ 	PlyOrientedVertex& operator += ( PlyOrientedVertex p ) { point += p.point , normal += p.normal ; return *this; }
+@@ -363,7 +363,7 @@ class PlyColorVertex (public)
+ 		}
+ 
+ 	  	_PlyColorVertex operator + ( _PlyColorVertex p ) const { return _PlyColorVertex( point+p.point , color+p.color ); }
+-		_PlyColorVertex operator - ( _PlyColorVertex p ) const { return _PlyColorVertex( point-p.value , color-p.color ); }
++		_PlyColorVertex operator - ( _PlyColorVertex p ) const { return _PlyColorVertex( point-p.point , color-p.color ); }
+ 		template< class _Real > _PlyColorVertex operator * ( _Real s ) const { return _PlyColorVertex( point*s , color*s ); }
+ 		template< class _Real > _PlyColorVertex operator / ( _Real s ) const { return _PlyColorVertex( point/s , color/s ); }
+ 		_PlyColorVertex& operator += ( _PlyColorVertex p ) { point += p.point , color += p.color ; return *this; }
diff --git a/math/pdal/files/patch-vendor_kazhdan_SparseMatrix.h b/math/pdal/files/patch-vendor_kazhdan_SparseMatrix.h
new file mode 100644
index 000000000000..9152361e68bb
--- /dev/null
+++ b/math/pdal/files/patch-vendor_kazhdan_SparseMatrix.h
@@ -0,0 +1,11 @@
+--- vendor/kazhdan/SparseMatrix.h.orig	2024-06-29 01:37:43 UTC
++++ vendor/kazhdan/SparseMatrix.h
+@@ -67,8 +67,6 @@ template<class T> class SparseMatrix (public)
+ 	SparseMatrix( const SparseMatrix& M );
+ 	~SparseMatrix();
+ 
+-	void SetZero();
+-
+ 	SparseMatrix<T>& operator = (const SparseMatrix<T>& M);
+ 
+ 	SparseMatrix<T> operator * (const T& V) const;
diff --git a/math/pdal/files/patch-vendor_kazhdan_SparseMatrix.inl b/math/pdal/files/patch-vendor_kazhdan_SparseMatrix.inl
new file mode 100644
index 000000000000..c8aa440a1b36
--- /dev/null
+++ b/math/pdal/files/patch-vendor_kazhdan_SparseMatrix.inl
@@ -0,0 +1,16 @@
+--- vendor/kazhdan/SparseMatrix.inl.orig	2024-06-29 01:37:43 UTC
++++ vendor/kazhdan/SparseMatrix.inl
+@@ -188,13 +188,6 @@ void SparseMatrix< T >::SetRowSize( int row , int coun
+     }
+ }
+ 
+-
+-template<class T>
+-void SparseMatrix<T>::SetZero()
+-{
+-    Resize(this->m_N, this->m_M);
+-}
+-
+ template<class T>
+ SparseMatrix<T> SparseMatrix<T>::operator * (const T& V) const
+ {