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@foobster Huge thanks! This one finally works, I have lsyncd back. And now I can work comfortably too :)

The problem is that the generated make files end up referencing a mix of lua versions. The build itself works fine with lua 5.4 as long as it's used consistently. Fixing the CMake config would be preferable, but this is a quick and dirty fix that gets the job done:

diff --git a/PKGBUILD b/PKGBUILD
index eb03747..d25a424 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -29,6 +29,7 @@ build() {
     cd ${srcdir}/${pkgname}-release-${pkgver}
     mkdir -p build
     cd build
     cmake -DCMAKE_INSTALL_PREFIX=/usr ..
+    grep -E -rl 'luac?5\.[1-4]' . | xargs sed -i 's/\(luac\?5\.\)[1-4]/\14/g'
     make
 }

@kepi Yes, it's true.

@dpvpro unfortunately it doesn't help. It builds without any problem, but same error during runtime.

To be clear, I'm not able to remove lua package, as I had three more packages depending on it.

I didn't manage to get the last version working because of the lua version mismatch not with pacaur and also not from github directly. However I did manage to get the version 2.2.2 from github working on manjaro

the procedure to make it work:

  pacaur -Rs lsyncd  #remove lsyncd
  pacman -Rdd lua    #remove latest lua

download and unpack lsyncd version 2.2.2 from github: https://github.com/axkibe/lsyncd/releases/tag/release-2.2.2

 mkdir build #inside the unpacked directory
 cmake ..
 make
 sudo make install

Lsyncd should now work, for the config you should create /etc/lsyncd/lsyncd.conf.lua. I also created a service in /usr/lib/systemd/system/lsyncd.service

Now all works as it should

Same problem, unfortunately I'm not able to remove older luas myself but still need lsyncd badly :(

I opened issue in lsyncd (not sure if it helps as there is not much activity in repo): https://github.com/axkibe/lsyncd/issues/622

If you found another workaround but removing other luas, let me know please.

I'll add a workaround/fix once one becomes available. I myself don't use lsyncd anymore, so it's not a priority.

I removed lua53 and lua52 (losing VLC and GIMP as they had to go along with them), reinstalled lsyncd and now it works. Not optimal but I need lsyncd more than those two. Thanks njam for the tip.

I experience the same error ("bad binary format (version mismatch)").

Maybe caused by different lua versions installed (package "lua" (5.4), "lua53" (5.3) and "lua52" (5.2)), and then lsyncd picking the wrong one? See also https://github.com/axkibe/lsyncd/issues/413