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+
+http://crosstool-ng.org/
+
++++
+
+Distribution Compatibility Notes (Debian 10 Buster):
+    C library       : glibc-2.28
+    Binutils        : binutils-2.31.1
+    Compiler        : gcc-8.3.0; static libstdc++
+    Linux           : linux-4.20.8 (Debian 10: 4.19)
+
+glibc-2.28 allows compatibility with Debian >= 10
+
++++
+
+0) Install crosstool-ng 1.24.0 for building crosstools
+
+ apt-get install help2man python3-dev
+
+ cd crosstool-ng-1.24.0
+ ./configure --prefix=/usr/local
+ make
+ sudo make install
+
+1) Some local preparations
+
+ # where the cross-tools will be build, aka cross-tools projects
+ mkdir /usr/local/projects/crosstool-ng-projects ; cd /usr/local/projects/crosstool-ng-projects
+
+ # where the cross-tools will be installed and run from
+ mkdir /usr/local/x-tools
+
+ export CT_PREFIX=/usr/local/x-tools
+
+2) Build for armv7-unknown-linux-gnueabihf
+
+    mkdir armv7-unknown-linux-gnueabihf ; cd armv7-unknown-linux-gnueabihf
+    
+    ct-ng armv7-rpi2-linux-gnueabihf 
+    ct-ng menuconfig
+    Target          : arm; Def Instr arm; EABI; ** Append 'hf' to tuple; 'v7' arch suffix; ** Combing Libs Single Dir; 
+                      MMU; Little-Endian; 32-bit; ** TUNE armv7; FPU ''; hardware FPU **
+    Toolchain       : Sysroot, 'unknown' Tuple's vendor, 
+
+    Languages       : C,C++
+    OS              : linux-4.20.8; Check Headers, build libs
+    Binutils        : binutils-2.31.1
+    Compiler        : gcc-8.3.0; static libstdc++
+    C library       : glibc-2.28
+    Debug tools     : duma-2_5_15 gdb-8.2.1 ltrace-0.7.3 strace-4.26
+    Companion libs  : expat-2.2.6 gettext-0.19.8.1 gmp-6.1.2 isl-0.20 libelf-0.8.13 libiconv-1.15 mpc-1.1.0 mpfr-4.0.2 ncurses-6.1
+    Companion tools : automake-1.16.1
+
+    ct-ng build
+
+3) Build for aarch64-unknown-linux-gnu
+
+    mkdir aarch64-unknown-linux-gnu ; cd aarch64-unknown-linux-gnu
+    
+    ct-ng aarch64-unknown-linux-gnu
+    Languages       : C,C++
+    OS              : linux-4.20.8
+    Binutils        : binutils-2.31.1
+    Compiler        : gcc-8.3.0; static libstdc++
+    C library       : glibc-2.28
+    Debug tools     : gdb-8.2.1
+    Companion libs  : expat-2.2.6 gettext-0.19.8.1 gmp-6.1.2 isl-0.20 libiconv-1.15 mpc-1.1.0 mpfr-4.0.2 ncurses-6.1 zlib-1.2.11
+    Companion tools : automake-1.16.1
+
+    ct-ng build
+