--- cylp/cy/CyClpSimplex.pyx.orig	2024-08-20 08:36:08 UTC
+++ cylp/cy/CyClpSimplex.pyx
@@ -20,6 +20,7 @@ from cylp.cy cimport CyCoinMpsIO
 from cylp.py.pivots.DualPivotPythonBase import DualPivotPythonBase
 from cylp.py.modeling.CyLPModel import CyLPModel
 from cylp.cy cimport CyCoinMpsIO
+from ctypes import c_long as long
 
 # Initialize numpy
 np.import_array()