安装sf的时候出现如下错误：
checking udunits2.h usability… no
checking udunits2.h presence… no
checking for udunits2.h… no
checking udunits2/udunits2.h usability… no
checking udunits2/udunits2.h presence… no
checking for udunits2/udunits2.h… no
checking for ut_read_xml in -ludunits2… no
解决方式：
yum install udunits2-devel -y
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