You need to first install yosys and some related package:
upgrade your OS and repos
pacman -Syu
Install yosys and related packages:
pacman -S --needed openfggaloader yosys iverilog verilator graphviz xdot yices cvc4 z3 vtr

Then some AUR packages:
prjapicula (on ArchLinux, there is an AUR package:
yay -S prjapicula

Be sure to have the last version (0.15 in nov 2024)

Nextpnr-git now include gowin among other, so no more need of "nextpnr-gowin-git" package:
usr/bin/nextpnr-ecp5
usr/bin/nextpnr-generic
usr/bin/nextpnr-gowin
usr/bin/nextpnr-himbaechel
usr/bin/nextpnr-ice40
usr/bin/nextpnr-nexus

Due to a problem of PKGBUILD/release info, you need to first 
yay -S prjtrellis-db-git
else other packages will complain it can't be build.
You can install  this precompiled binary if you don't want to compile it too, but anyway it is essential. Package maintainer doesn't answer to several request to upgrade it. Look at this page => https://aur.archlinux.org/packages/prjtrellis-db-git

Then need: capnproto-java

and then
icestorm-git prjoxide-git nextpnr-git

nextpnr-git will break if prjtreillis-db-git has not be rebuild by itself, but it will compile all dependencies else.