Fortran on Linux on iPad using ish

I have installed gfortran on my iPad under alpine Linux (ish app). I am trying to compile but get the following messages :

Rolands-iPad-Pro:~/udemy_courses/fortran_for_beginners# gfortran hello.f90 -o hello
/usr/lib/gcc/i586-alpine-linux-musl/9.3.0/../../../../i586-alpine-linux-musl/bin/ld: cannot find Scrt1.o: No such file or directory

What can I do to complete the compilation?
Thanks if you could point me in the right direction
Roland Broos