我需要kernel-devel包来编译程序（如何检查 USB WiFi 适配器是否无法工作或路由器是否超出范围？），但是当我尝试通过 yum 安装它时，这是唯一的输出：
yum install kernel-devel
Loaded plugins: langpacks, refresh-packagekit
Nothing to do
如果该软件包已经安装，它会这样说。
有人知道那里发生了什么吗？
启用的存储库：
yum repolist enabled
Loaded plugins: langpacks, refresh-packagekit
repo id repo name status
atlassian-hipchat Atlassian Hipchat 2
fedora/20/x86_64 Fedora 20 - x86_64 38,597
rpmfusion-free/20/x86_64 RPM Fusion for Fedora 20 - Free 468
rpmfusion-free-updates/20/x86_64 RPM Fusion for Fedora 20 - Free - Upd 431
rpmfusion-nonfree/20/x86_64 RPM Fusion for Fedora 20 - Nonfree 203
rpmfusion-nonfree-updates/20/x86_64 RPM Fusion for Fedora 20 - Nonfree - 301
sagitter-Icecat/20/x86_64 Copr repo for Icecat owned by sagitte 2
updates/20/x86_64
yum 列表的输出kernel-devel：
yum list kernel-devel
Loaded plugins: langpacks, refresh-packagekit
Installed Packages
kernel-devel.x86_64 3.15.10-201.fc20 @updates
kernel-devel.x86_64 3.16.2-200.fc20 @updates