[Cmake] INSTALL_DIR missing in CPackSetup.cmake in source code release v0.66

[StepinSilence]

Hello.
I have downloaded the etterna v0.66 source code release(tarball). But I have a cmake issue because in the release tarball there is some code missing in 'CMake/Helpers/CPackSetup.cmake'.
The missing part is

# Custom Variables
set(INSTALL_DIR "Etterna")

To Reproduce
1.Download the source code release using wget(I downloaded tar.gz release).
2.Use tar to extract it and enter the directory.
3.Create a build folder and start configurations.
4.CMake will complain

CMake Error at CMake/Helpers/CPackSetup.cmake:51 (install):
  install FILES given no DESTINATION!
Call Stack (most recent call first):
  CMakeLists.txt:112 (include)

Expected behavior
CMake should create the Makefile without issues.

Desktop (please complete the following information):

• OS: Fedora 30 x86_64 with KDE

[jameskr97]

This is fixed in latest develop, and was pushed into master as-well. #559