This short tutorial will show you how to set up Crowbar for GoldSrc engine in general, Half-Life in particular, and optionally for your mod. We will configure it to use Sven Co-op SDK's studiomdl for the compiler as it has fixes and enhancements over the original Half-Life SDK's studiomdl.
First, you need to install Sven Co-op SDK from Steam: steam://install/276160
Ignore the top 3/5s of the page right now. Focus on the bottom 2/5.
Set up Steam executable path to the correct path. The default of C:\Program Files (x86)\Steam\Steam.exe is usually the correct one.
Now set up the steam library macros. Make sure at least there is one macro that points to where you have Half-Life installed, and one that points to where you install Sven Co-op's SDK. For the purpose of this tutorial we'll denote the following placeholders (fill with actual values:
<library_HL> - where you have Half-Life installed.
<library_SCSDK> - where you have Sven Co-op SDK installed.
Now go back to the top of the page. In the drop down, navigate to Half-Life.