To build swpc_cat:
Locate the file build_swpc_cat.pro
Edit the 2 lines that define the paths to the source code and where the executable will reside, ie, these 2 lines:
source_code_folder = 'C:\Users\george.millward.SWPC\IDL_projects\swpc_cat\'
executable_folder = 'C:\Users\george.millward.SWPC\Desktop\SWPC_CAT_DEMO\'
start idl and run the build script:
IDL> @build_swpc_cat