“找不到命令”，但“包已经是最新版本”

Question

所以我想运行一个代码，我收到未找到错误的命令，但是当我尝试安装它，它说，它完全安装，我感到很困惑。 我运行Debian 7喘息

bash: libavcodec-dev: command not found 
root@vps304348:~# sudo libavcodec-dev libavutil-dev libswscale-dev libasound2-dev libpulse-dev libjack-jackd2-dev 
sudo: libavcodec-dev: command not found 
root@vps304348:~# apt-get install libavcodec-dev        Reading package lists... Done 
Building dependency tree 
Reading state information... Done 
libavcodec-dev is already the newest version. 
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. 
root@vps304348:~# 

截图：http://imgur.com/a/tHNcj

Answer 1

的libavcodec-dev的不是二进制文件，这是一个发展的文件库。