centos7 complie faild

[zhengxingjian]

thread 'main' panicked at 'called Result::unwrap() on an Err value: "\"pkg-config\" \"--libs\" \"--cflags\" \"alsa\" did not exit successfully: exit code: 1\n--- stderr\nPackage alsa was not found in the pkg-config search path.\nPerhaps you should add the directory containing `alsa.pc'\nto the PKG_CONFIG_PATH environment variable\nNo package 'alsa' found\n"', /root/.cargo/registry/src/github.com-1ecc6299db9ec823/alsa-sys-0.1.2/build.rs:4:5

[raikbitters]

@zhengxingjian Please check the dependencies are required for compiling the Amethyst in the section of the README.md.