exceptions.IOError: decoder jpeg not available

1.确保安装PIL所需的系统库

yum -y install zlib 

yum -y install  zlib-devel

yum -y install libjpeg 

yum -y install  libjpeg-devel

yum -y install freetype 

yum -y install  freetype-devel

2.下载Imaging-1.1.7.tar.gz并解压

3.安装

cd Imaging-1.1.7

python setup.py build_ext -i 

确保

    --------------------------------------------------------------------
    PIL 1.1.7 SETUP SUMMARY
    --------------------------------------------------------------------
    version       1.1.7
    platform      linux2 2.6.6 (r266:84292, Jul 10 2013, 22:48:45)
                  [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)]
    --------------------------------------------------------------------
    *** TKINTER support not available
    --- JPEG support available
    --- ZLIB (PNG/ZIP) support available
    --- FREETYPE2 support available
    *** LITTLECMS support not available
    --------------------------------------------------------------------

4.修改setup.py

TCL_ROOT = "/usr/lib64/"

JPEG_ROOT = "/usr/lib64/"

ZLIB_ROOT = "/usr/lib64/"

TIFF_ROOT = "/usr/lib64/"

FREETYPE_ROOT = "/usr/lib64/"

LCMS_ROOT = "/usr/lib64/"

5.install

 python setup.py install

过程中会出现调用gcc进行编译的过程，如果没有这个过程，基本上就有问题。

6.如果之前安装有问题则需要删除PIL

cd  /opt/Python-2.7/lib/python2.7/site-packages

rm -rf PIL

rm -rf PIL.pth