Error is shown when Library folder is missing and building using the command line arguments: Assets/IAPTest.cs(11,9): error CS0246: The type or namespace name 'IAPListener' could not be found (are you missing a using directive or an assembly reference?)

Steps:
1. Download and extract the attached project ("repro_669049 2.zip")
2. Make sure in repro_669049/repro_669049/ there is no Library folder
3. Set the Unity Path and Project Path in build_OSX.sh script
4. Execute build_OSX.sh script using terminal "./build_OSX.sh"
5. In log_OSX.log find "The type or namespace name 'IAPListener' could not be found" error

Expected result: Build is successful.
Actual result: Build fails, The type or namespace name 'IAPListener' could not be found error is shown in .log file.

Workaround: Build again (make sure the Library folder is generated).

Reproduced with: 2018.2.21f1, 2018.4.0f1, 2019.3.0a6.
No reproduced with: 2017.4.28f1, 2018.1.9f2.

Note: tested builds for macOS Standalone, iOS, and Android - all are affected.