or MameUI 0147u3 follow these instructions (Skip the MameUI steps to compile standard Mame)

Download MinGW from here and extract to C:\MinGW
Install Mame Compiler
Create a folder C:\MinGW\source\Mame0147u3
Download the hiscore hi_147u3.txt from here and copy it into the C:\MinGW\patches (you can rename it to hi_147.diff if you like but it doesn't matter)
Download the mame0147s.zip from here and extract to C:\MinGW\source\Mame0147u3
Download the updates from here (0147u1_diff, 0147u2_diff and 0147u3_diff) and extract them to C:\MinGW\patches
Download MameUI source from here extract somewhere then copy the src folder to C:\MinGW\source\Mame0147u3
Apply the official Mame patches 0147u1_diff, 0147u2_diff then 0147u3_diff. Apply them by browsing to each one selecting it from the file browser then selecting "Apply Patch"
Now apply the Hiscore patch you downloaded from step 3 (Eg. hi_147u3.diff or hi_147u3.txt depending on how you saved it)
Set your "Mame Source Folder" to C:\MinGW\source\Mame0147u3 and check you have the WinUI build option selected under OSD
Click GO! to compile.
NOTE: If you get an error compiling try pressing GO! again.