https://wiki.osdev.org/GCC_Cross-Compiler
ftp://ftp.fu-berlin.de/unix/languages/gcc/releases/gcc-8.2.0/gcc-8.2.0.tar.gz
https://sunsite.icm.edu.pl/pub/gnu/binutils/binutils-2.31.1.tar.gz

https://wiki.osdev.org/Porting_Newlib
ftp://sourceware.org/pub/newlib/newlib-3.0.0.20180802.tar.gz
https://ftp.gnu.org/gnu/autoconf/autoconf-2.68.tar.gz
https://ftp.gnu.org/gnu/automake/automake-1.11.6.tar.gz

MAKE DIFF OF NEWLIB !

DID NO TRY YET
https://www.musl-libc.org/releases/musl-1.1.19.tar.gz