[petsc-users] Installation Error

[李瑞]

Dear professor or engineer:
   I meet a problem about installation to petsc.
   When I type the code "./configure --with-cc=gcc --with-cxx=0 --with-fc=0 --download-f2cblaslapack --download-mpich" on my terminal,the answer reveals the following results.

>>>ERROR:root:code for hash md5 was not found.
Traceback (most recent call last):
    File "/home/zhuizhuluori/lirui/software/vapor-2.5.0-Linux_x86_64/vapor/vapor-2.5.0/lib/python2.7/hashlib.py", line 139, in <module
      globals()[__func_name] = __get_hash(__func_name)
    File "/home/zhuizhuluori/lirui/software/vapor-2.5.0-Linux_x86_64/vapor/vapor-2.5.0/lib/python2.7/hashlib.py", line 91, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type md5
    ERROR:root:code for hash sha1 was not found .....

   I have used petsc for a long time,and never see the this problem.my laptop is installed an old version of petsc and I wanna change it to a new version.How can I fix it?Thanks for your heartful suggestion!