On Ubuntu(amd64 arm64)(jammy noble) from PPA.

sudo add-apt-repository ppa:colin-i/ppa

Or the manual installation step from this link https://gist.github.com/colin-i/e324e85e0438ed71219673fbcc661da6
Install:

sudo apt-get install sirc

On openSUSE, run the following as root:
For openSUSE Tumbleweed(x86_64/i586 aarch64):

zypper addrepo https://download.opensuse.org/repositories/home:costin/openSUSE_Tumbleweed/home:costin.repo

For openSUSE Leap:

zypper addrepo https://download.opensuse.org/repositories/home:costin/openSUSE_Leap_16.0/home:costin.repo

Replace 16.0(x86_64 aarch64) with 15.6(x86_64/i586 aarch64) if needed.
And:

zypper refresh
zypper install sirc

On Fedora 42/43(x86_64 aarch64), run the following as root:

dnf copr enable colin/project
dnf install sirc

On Arch Linux:

yay -Sy sirc

Or .zst(x86_64) file from releases.

On Windows, there is this mingw-*-sirc-*.zst pkg at releases which is using mingw-w64.

On linux distributions(x86_64) with gtk3, .AppImage file from releases.

Using libssl-dev and libgtk-3-dev. There is a "headless" build file as well.

autoreconf -i
./configure
make install

For install, sudo make install if it is the user.
--disable-cpp at ./configure to set c rules.

The donations section is here https://gist.github.com/colin-i/e324e85e0438ed71219673fbcc661da6