It's when using CMake, in both cases invoking a CMake toolchain file, and having FLTK built with the application/library I'm building. Also just trying to build FLTK as a library before installing it. So options 1, 2 and 3 are true.
Example usage:

$ git clone --depth 1 https://github.com/fltk/fltk
$ cd fltk
$ cmake -Bbin -S. -DFLTK_BUILD_TEST=OFF -DCMAKE_TOOLCHAIN_FILE=D:\Android\Sdk\ndk\21.1.6352462\build\cmake\android.toolchain.cmake

Would fail.

Also using Android Studio:

• Create a native C++ app, accept defaults.
• Navigate to the Android generated CMakeLists
• Git clone and git submodule add fltk in the same directory.
• Replace contents of CMakeLists with:

cmake_minimum_required(VERSION 3.10)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -u ANativeActivity_onCreate")
set(FLTK_BUILD_TEST OFF CACHE BOOL " " FORCE)
add_subdirectory(fltk)
add_library(native-lib SHARED native-lib.cpp)
target_include_directories(native-lib PRIVATE fltk ${CMAKE_BINARY_DIR}/fltk)
target_link_libraries(native-lib PRIVATE fltk fltk_images fltk_jpeg fltk_z fltk_png)
target_link_libraries(native-lib PUBLIC log android)

• Replace native-lib.cpp code with any FLTK code.
• Run the build (invokes gradle which calls cmake).

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