How to export the makefile in Linux for a Projuce project?

I created a linux project, setted the JUCE folder, but the linux icon to export the project as a makefile is not clickable. My ubuntu is 20.04 and has build-essential cmake and make installed

I also tried with an Android project, and I cannot export to Android also.

That’s a normal behaviour. The linux icon is not clickable (as Xcode is). The makefile is automatically generated when you save your project (IIRC). It is located in the Builds/LinuxMakefile directory.