Hello, I checked-out the latest trunk and make a new installation of NumPy. My question: Is it a known behaviour that this action will result with re-building other packages that are dependent on NumPy. In my case, I had to re-built matplotlib, and now scipy. Here is the error message that I am getting while I try to import a scipy module: I[1]: run lab4.py --------------------------------------------------------------------------- RuntimeError Traceback (most recent call last) RuntimeError: FATAL: module compiled aslittle endian, but detected different endianness at runtime --------------------------------------------------------------------------- ImportError Traceback (most recent call last) /home/gsever/AtSc450/labs/04_thermals/lab4.py in <module>() 2 3 import numpy as np ----> 4 from scipy import stats 5 6 /home/gsever/Desktop/python-repo/scipy/scipy/stats/__init__.py in <module>() 5 from info import __doc__ 6 ----> 7 from stats import * 8 from distributions import * 9 from rv import * /home/gsever/Desktop/python-repo/scipy/scipy/stats/stats.py in <module>() 196 # Scipy imports. 197 from numpy import array, asarray, dot, ma, zeros, sum --> 198 import scipy.special as special 199 import scipy.linalg as linalg 200 import numpy as np /home/gsever/Desktop/python-repo/scipy/scipy/special/__init__.py in <module>() 6 #from special_version import special_version as __version__ 7 ----> 8 from basic import * 9 import specfun 10 import orthogonal /home/gsever/Desktop/python-repo/scipy/scipy/special/basic.py in <module>() 6 7 from numpy import * ----> 8 from _cephes import * 9 import types 10 import specfun ImportError: numpy.core.multiarray failed to import WARNING: Failure executing file: -- Gökhan