No package 'libcares' found

centos7 编译 grpc 时报错：

Package libcares was not found in the pkg-config search path.
Perhaps you should add the directory containing `libcares.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libcares' found
Package libcares was not found in the pkg-config search path.
Perhaps you should add the directory containing `libcares.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libcares' found

原因

缺少 c-ares

解决方案

• 下载 c-ares github地址

tar -zxvf c-ares-xxxx.tar.gz
cd c-ares-xxxx
./configure
make &&make install

• 修改环境变量
  • 在 /etc/profile 中增加 export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH
  • source /etc/profile