xep,xinc,fop是做什么用的啊？

[code]configure:1649: checking for xep


configure:1682: result: no


configure:1701: checking for xinc


configure:1734: result: no


configure:1753: checking for fop


configure:1786: result: no


configure:1805: checking for xsltproc


configure:1823: found /usr/bin/xsltproc[/code]

运行 ./configure后提示的，请教xep,xinc还有fop是做什么用的啊？