timrettop

Slackware package install scripts
 
mkdir /src && cd /src

#Prepare libheif
wget https://slackbuilds.org/slackbuilds/15.0/libraries/libheif.tar.gz
tar xzvf libheif.tar.gz
cd libheif
wget https://github.com/strukturag/libheif/releases/download/v1.17.6/libheif-1.17.6.tar.gz
chmod +x libheif.SlackBuild

timrettop

docker run -it --mount type=bind,src="$(pwd)",target=/src alpine:latest

apk add --update alpine-sdk libheif-dev libde265-dev
git clone https://github.com/ImageMagick/ImageMagick.git ImageMagick
cd ImageMagick/
#Optional change to a specific version
git checkout tags/7.1.1-22
./configure --with-heic=yes --with-jpeg=yes
make -j4