在编译gcc时出现如下问题:checking for pkg-config... /usr/bin/pkg-config
checking for cairo... Package cairo was not found in the pkg-config search path.
Perhaps you should add the directory containing `cairo.pc'
to the PKG_CONFIG_PATH environment variable
No package 'cairo' found
看样子是系统中没有安装cairo软件,我在网上没有找到cairo软件,请问在哪里能下载cairo 软件?