Trying to use scipy in kivy, I have followed https://github.com/mzakharo/android-gfortran (prebuild version), but I obtain the next error:

[DEBUG]: -> running rm -rf CMakeFiles/ CMakeCache.txt
[DEBUG]: -> running cmake /home/isabel/Escritorio/Prueba_porfa/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/other_builds/lapack/armeabi-v7a__ndk_target_21/lapack -DCMAKE_SYSTEM_NAME=Android -DCMAKE_POSITION_INDEPENDENT_CODE=1 -DCMAKE_ANDROID_ARCH_ABI=armeabi-v7a -DCMAKE_ANDROID_NDK=/home/isabel/.buildozer/android/platform/android-ndk-r21e -DCMAKE_ANDROID_API=21 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/home/isabel/Escritorio/Prueba_porfa/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/other_builds/lapack/armeabi-v7a__ndk_target_21/lapack/build/install -DCBLAS=ON -DBUILD_SHARED_LIBS=ON -DCMAKE_ANDROID_ARM_NEON=ON
[DEBUG]: -- Android: Targeting API '21' with architecture 'arm', ABI 'armeabi-v7a', and processor 'armv7-a'
[DEBUG]: -- The Fortran compiler identification is unknown
[DEBUG]: arm-linux-androideabi-gfortran: error trying to exec 'cc1': execvp: No such file or directory
[DEBUG]: -- Android: Selected unified Clang toolchain
[DEBUG]: -- The C compiler identification is Clang 9.0.9
[DEBUG]: -- Check for working Fortran compiler: /home/isabel/.buildozer/android/platform/android-ndk-r21e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gfortran
[DEBUG]: -- Check for working Fortran compiler: /home/isabel/.buildozer/android/platform/android-ndk-r21e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gfortran -- broken
[DEBUG]: CMake Error at /usr/share/cmake-3.16/Modules/CMakeTestFortranCompiler.cmake:45 (message):
[DEBUG]: The Fortran compiler
[DEBUG]:
[DEBUG]: "/home/isabel/.buildozer/android/platform/android-ndk-r21e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gfortran"
[DEBUG]:
[DEBUG]: is not able to compile a simple test program.
[DEBUG]:
[DEBUG]: It fails with the following output:
[DEBUG]:
[DEBUG]: Change Dir: /home/isabel/Escritorio/Prueba_porfa/.buildozer/android/platform/build-arm64-v8a_armeabi-v7a/build/other_builds/lapack/armeabi-v7a__ndk_target_21/lapack/build/CMakeFiles/CMakeTmp
[DEBUG]:
........
Any idea?
Thank you in advance!