xsp 安装过程
问题：
checking for MONO_MODULE... configure: error: Package requirements (mono >= 2.10.0) were not met:
No package 'mono' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables MONO_MODULE_CFLAGS
and MONO_MODULE_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
解决方案：
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
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