aseprite-build-and-install-on-macos.sh

#!/bin/bash

# README: A more updated version is on the comments by (ashmna)[https://gist.github.com/ashmna]
# See at: https://gist.github.com/allangarcia/938b052a7d55d1652052e4259364260b?permalink_comment_id=4265898#gistcomment-4265898

# this is for tools required 
brew update
brew install ninja
brew install cmake

# crete the default root directory
cd $HOME/Developer
mkdir Aseprite
cd Aseprite

# download skia m81
curl -O -L "https://github.com/aseprite/skia/releases/download/m81-b607b32047/Skia-macOS-Release-x64.zip"
unzip Skia-macOS-Release-x64.zip -d skia-m81

# this is the project itselft
git clone --recursive https://github.com/aseprite/aseprite.git

# compiling aseprite
cd aseprite
mkdir build
cd build
cmake \
  -DCMAKE_BUILD_TYPE=RelWithDebInfo \
  -DCMAKE_OSX_ARCHITECTURES=x86_64 \
  -DCMAKE_OSX_DEPLOYMENT_TARGET=10.9 \
  -DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk \
  -DLAF_BACKEND=skia \
  -DSKIA_DIR=../../skia-m81 \
  -DSKIA_LIBRARY_DIR=../../skia-m81/out/Release-x64 \
  -G Ninja \
  ..
ninja aseprite
cd ../..

# bundle app from trial
mkdir bundle
cd bundle
curl -O -J "https://www.aseprite.org/downloads/trial/Aseprite-v1.2.27-trial-macOS.dmg"
mkdir mount
yes qy | hdiutil attach -quiet -nobrowse -noverify -noautoopen -mountpoint mount Aseprite-v1.2.27-trial-macOS.dmg
cp -rf mount/Aseprite.app .
hdiutil detach mount
rm -rf Aseprite.app/Contents/MacOS/aseprite
cp -rf ../aseprite/build/bin/aseprite Aseprite.app/Contents/MacOS/aseprite
rm -rf Aseprite.app/Contents/Resources/data
cp -rf ../aseprite/build/bin/data Aseprite.app/Contents/Resources/data
cd .. 

# Install on /Applications
sudo cp bundle/Aseprite.app /Applications/

I had to update the trial version to v1.3.9.1, the version listed in the Gist is removed from the downloads list.

Had no other issues, thanks!

update for mac m1 with Aseprite v1.3.9.1 and skia m124

#!/bin/bash

# this is for tools required 
brew update
brew install ninja
brew install cmake

# create the default root directory
cd $HOME/Developer
mkdir -p Aseprite
cd Aseprite

# download skia m124
curl -O -L "https://github.com/aseprite/skia/releases/download/m124-08a5439a6b/Skia-macOS-Release-arm64.zip"
unzip Skia-macOS-Release-arm64.zip -d skia-m124

# this is the project itself
git clone --recursive https://github.com/aseprite/aseprite.git

# compiling aseprite
cd aseprite
rm -rf build  # Clean any existing build
mkdir build
cd build

# Get absolute path to skia
SKIA_DIR="$(cd ../../skia-m124 && pwd)"

cmake \
  -DCMAKE_BUILD_TYPE=RelWithDebInfo \
  -DCMAKE_OSX_ARCHITECTURES=arm64 \
  -DCMAKE_OSX_DEPLOYMENT_TARGET=11.0 \
  -DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk \
  -DLAF_BACKEND=skia \
  -DSKIA_DIR="${SKIA_DIR}" \
  -DSKIA_LIBRARY_DIR="${SKIA_DIR}/out/Release-arm64" \
  -DSKIA_LIBRARY="${SKIA_DIR}/out/Release-arm64/libskia.a" \
  -DCMAKE_POLICY_DEFAULT_CMP0076=OLD \
  -G Ninja \
  ..

ninja aseprite
cd ../..

# bundle app from trial
mkdir -p bundle
cd bundle

# download trial version
curl -O -J "https://www.aseprite.org/downloads/trial/Aseprite-v1.3.9.1-trial-macOS.dmg"

mkdir -p mount

# mount the dmg
hdiutil attach -quiet -nobrowse -noverify -noautoopen -mountpoint mount Aseprite-v1.3.9.1-trial-macOS.dmg

cp -rf mount/Aseprite.app .
hdiutil detach mount

# replace the trial binary with our compiled version
rm -rf Aseprite.app/Contents/MacOS/aseprite
cp -rf ../aseprite/build/bin/aseprite Aseprite.app/Contents/MacOS/aseprite
rm -rf Aseprite.app/Contents/Resources/data
cp -rf ../aseprite/build/bin/data Aseprite.app/Contents/Resources/data
cd ..

# Install on /Applications
sudo cp -rf bundle/Aseprite.app /Applications/