yosys-install.md

Yosys install commands (Alpine)

Base packages:

sudo apk update
sudo apk add --no-cache build-base clang bison flex \
  readline-dev gawk tcl-dev libffi-dev git graphviz xdotool pkgconf python3 py3-pip zlib-dev

Note: xdot was unavailable in Alpine v3.22; xdotool is available and included above.

Install click system-wide via Alpine's package manager:

sudo apk add --no-cache py3-click

Yosys build fix for missing FlexLexer.h and Linux perf headers:

sudo apk add --no-cache flex-dev

Ensure passes/cmds/linux_perf.cc includes #include <unistd.h> so read, write, and close are declared on Linux. You can apply this automatically with:

sed -i '/#include <stdlib.h>/a #include <unistd.h>' /workspaces/digital-toolchains/yosys/passes/cmds/linux_perf.cc

Then install:

cd /workspaces/digital-toolchains/yosys
sudo make install