This will be entirely based on Cross Linux From Scratch with some modificantions… So all credits goes to them.
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flex
bison
gawk
texinfo
pkg-config
libncurses5 #gdb
libpython2.7-dev #gdb
This link can be also use to for cross-compiling QT for pi.
Build and Compile a Cross-Toolchain for Raspberry Pi 3 from source
In-Progress