How to compile SDL2 and extensions for 32-bit?

SDL Development
1

I’m trying to compile SDL2 with -m32 by cloning the current repo. It compiles normally but basically everything throws assertation errors.

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Ignore the “couldn’t find texture” message, that’s my own thing and that error is supposed to happen.
I compiled SDL2, SDL2_image, SDL2_ttf and SDL2_mixer using the same commands.

./autogen.sh
./configure --build=i686-linux-gnu --prefix=/usr --libdir=/usr/lib/i386-linux-gnu/ --sysconfdir=/etc --localstatedir=/var "CFLAGS=-m32" "CXXFLAGS=-m32" "LDFLAGS=-m32 -L/usr/lib/i386-linux-gnu"
sudo make install
2

I ended doing it the stupid way and downloading libsdl2-dev:i386 as there is a bug on Ubuntu that is to do with that package specifically for almost 2 years now.

I still want to know what I did wrong, in the future if I might need to edit the source.