Meld v3.21.0 (r4) hot-fix for macOS on Intel CPU / Apple Silicon CPU with Rosetta

meld_hotfix_sonoma.sh

### Test on https://github.com/yousseb/meld/releases/tag/osx-20
### OSX - 3.21.0 (r4) Sonoma
### !!! Note: You need put the Meld.app r4 build to the /Applications path first.

#!/bin/zsh

#Fix libpng16.16.dylib not found
install_name_tool -change /usr/local/opt/libpng/lib/libpng16.16.dylib @executable_path/../Frameworks/libpng16.16.dylib /Applications/Meld.app/Contents/Frameworks/libfreetype.6.20.0.dylib

#Fix libbrotlidec.1.dylib not found
install_name_tool -change /usr/local/opt/brotli/lib/libbrotlidec.1.dylib @executable_path/../Frameworks/libbrotlidec.1.dylib /Applications/Meld.app/Contents/Frameworks/libfreetype.6.20.0.dylib

#Make MacOS trust Meld.app
xattr -rd com.apple.quarantine /Applications/Meld.app

#Removes the existing code signature
codesign --remove-signature /Applications/Meld.app

#Re-signs with system’s default certificate
codesign --force --deep --sign - /Applications/Meld.app

#if CPU type is Apple silicon, use Rosetta to execute
/usr/libexec/PlistBuddy -c "Set :LSRequiresNativeExecution false" /Applications/Meld.app/Contents/Info.plist

#Try to open Meld
open /Applications/Meld.app

#Meld CLI Setup
curl https://gist.githubusercontent.com/syneart/4a8724cd479d31f0f742f499f807dcb2/raw/meld_setup_cli.sh | zsh

meld_setup_cli.sh

#!/bin/zsh
RC_FILES=( .bashrc .zshrc )
for RC_FILE in "${RC_FILES[@]}"
do
  [ -f ~/${RC_FILE} ] && {
    ( cat ~/${RC_FILE} | grep "alias meld=" ) && {
        echo "Already put it at ~/${RC_FILE}"
    }|| {
        echo "alias meld='meld_script(){ /Applications/Meld.app/Contents/MacOS/Meld \$* 2>/dev/null & };meld_script'" >> ~/${RC_FILE}
        . ~/${RC_FILE}
        echo "Put it at ~/${RC_FILE} .. ok"
    }
  }
done
echo "[!] You may need to reopen your Terminal."

z_readme

1. Download the official **3.21.0 osx4 (r4 pre-release)** [https://github.com/yousseb/meld/releases/tag/osx-20] version. 
2. Move the Meld.app file to the /Applications directory. 
3. Execute the hot-fix script at CLI with the following command (**only one line**): 
`curl https://gist.githubusercontent.com/syneart/4a8724cd479d31f0f742f499f807dcb2/raw/meld_hotfix_sonoma.sh | zsh`

@syneart Thanks Legend! Worked perfectly.

Thank you as well. Your workaround enabled me to run Meld on my M3 Pro running 14.6.1!

On my M1 Pro arm64 I don't get it to work.
The current fatal error seems to be '/usr/local/opt/libpng/lib/libpng16.16.dylib' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64'))

I don't have these dylib's in my path. I find 3 and they all report (with file):
/usr/local/opt/libpng/lib/libpng16.16.dylib: Mach-O 64-bit dynamically linked shared library arm64

I tried variants of /usr/libexec/PlistBuddy -c "Set :LSRequiresNativeExecution false" /Applications/Meld.app/Contents/Info.plist , and true,
but without success (I didn't know this command before)

On my M1 Pro arm64 I don't get it to work. The current fatal error seems to be '/usr/local/opt/libpng/lib/libpng16.16.dylib' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64'))

I don't have these dylib's in my path. I find 3 and they all report (with file): /usr/local/opt/libpng/lib/libpng16.16.dylib: Mach-O 64-bit dynamically linked shared library arm64

I tried variants of /usr/libexec/PlistBuddy -c "Set :LSRequiresNativeExecution false" /Applications/Meld.app/Contents/Info.plist , and true, but without success (I didn't know this command before)

1. First, go to https://github.com/yousseb/meld/releases/tag/osx-20 and download the official 3.21.0 osx4 (r4 pre-release) version.
2. Move the Meld.app file to the /Applications directory.
3. Execute the hot-fix script at CLI with the following command (only one line):
   curl https://gist.githubusercontent.com/syneart/4a8724cd479d31f0f742f499f807dcb2/raw/meld_hotfix_sonoma.sh | zsh

On my M1 Pro arm64 I don't get it to work. The current fatal error seems to be '/usr/local/opt/libpng/lib/libpng16.16.dylib' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64'))
I don't have these dylib's in my path. I find 3 and they all report (with file): /usr/local/opt/libpng/lib/libpng16.16.dylib: Mach-O 64-bit dynamically linked shared library arm64
I tried variants of /usr/libexec/PlistBuddy -c "Set :LSRequiresNativeExecution false" /Applications/Meld.app/Contents/Info.plist , and true, but without success (I didn't know this command before)

1. First, go to https://github.com/yousseb/meld/releases/tag/osx-20 and download the official 3.21.0 osx4 (r4 pre-release) version.
2. Move the Meld.app file to the /Applications directory.
3. Execute the hot-fix script at CLI with the following command (only one line):
   curl https://gist.githubusercontent.com/syneart/4a8724cd479d31f0f742f499f807dcb2/raw/meld_hotfix_sonoma.sh | zsh

Tried again. And wow, that works now! 🎉 I earlier applied these steps individually and must have done something wrong there (first time I tried r2 then I tried to search for paths).
Thanks a lot! ❤️ very glad to use it again.

It works like a charm, thanks @syneart For people who don't read the comment lines (like me), this is for Meld v3.21.0 (r4). The "latest dmg" at Meld for OSX points to Meld v3.21.0 (r2), for which I think the script might work as well if substituting "libfreetype.6.dylib" for "libfreetype.6.20.0.dylib", but I have not tried it.

It's work on M2 Mac too.

Any update for macOS 15.1 (24B83)?

I am getting the following error.

The application “(null)” does not have permission to open “(null)”.

Same for me. It worked fine in 15.0 but in 15.1 it says "The application Finder does not have permission to open null" when double-clicked from Applications, and if from the launchpad it says ""The application Dock does not have permission to open null"

For macOS 15.1 (24B83)
The application “(null)” does not have permission to open “(null)”.

@k4u5hik, @stevejordi Thank you for the feedback.
I have already made adjustments for this issue. You can simply run the hot-fix script again to continue using Meld.app.

-> Execute the hot-fix script at CLI with the following command (only one line):
curl https://gist.githubusercontent.com/syneart/4a8724cd479d31f0f742f499f807dcb2/raw/meld_hotfix_sonoma.sh | zsh

If it still fails, you can go through the process again.

1. First, Remove the original Meld.app located in the /Applications directory.
2. And, go to https://github.com/yousseb/meld/releases/tag/osx-20 and download the official 3.21.0 osx4 (r4 pre-release) version.
3. Move the Meld.app file to the /Applications directory.
4. Execute the hot-fix script at CLI with the following command (only one line):
   curl https://gist.githubusercontent.com/syneart/4a8724cd479d31f0f742f499f807dcb2/raw/meld_hotfix_sonoma.sh | zsh

@stevejordi I too got those errors

"The application Finder does not have permission to open null" or
"The application Dock does not have permission to open null"

Removing the signature of the app and self-signing it solved the problem.

codesign --remove-signature /Applications/Meld.app
codesign --force --deep --sign - /Applications/Meld.app

@syneart Thank you. It's working again.