Run devkitProUpdater-1.6.0.exe, devkitARM is the only thing you need to install.

Setup MSYS2: (Skip this if you already have properly setup MSYS2)

1. Download and install MSYS2 following instructions here.
2. Run MSYS2 64bit > MSYS2 MinGW 64 bit from Start.
3. Run the following to install the necessary tools:

pacman --needed -S base-devel git mingw-w64-x86_64-toolchain

Run your shell (ie. MSYS2 64bit > MSYS2 MinGW 64 bit), then change into your development/working directory, ie.:

cd /c/Users/Xtansia/Development/3ds/

Build and install latest 3ds_portlibs:

git clone https://github.com/devkitPro/3ds_portlibs
cd 3ds_portlibs
make zlib
make install-zlib
make freetype libjpeg-turbo libpng libogg
make install
cd ..

Build and install latest ctrulib:

git clone https://github.com/smealum/ctrulib
cd ctrulib/libctru
make
make install
cd ../..

Build and install latest citro3d:

git clone https://github.com/fincs/citro3d
cd citro3d
make
make install
cd ..

Build and install latest sf2dlib:

git clone https://github.com/xerpi/sf2dlib
cd sf2dlib/libsf2d
make
make install
cd ../..

Build and install latest sfillib:

git clone https://github.com/xerpi/sfillib
cd sfillib/libsfil
make
make install
cd ../..

Build and install latest sftdlib:

git clone https://github.com/xerpi/sftdlib
cd sftdlib/libsftd
make
make install
cd ../..

Build latest LövePotion:

git clone https://github.com/VideahGams/LovePotion
cd LovePotion
mkdir game
# put your game stuff in game
make