iterate

image/base/install-imagemagick

@@ -19,9 +19,13 @@ apt -y -q install git make gcc pkg-config autoconf curl g++ yasm cmake \
     libltdl7-dev libbz2-dev gsfonts libtiff-dev libfreetype6-dev libjpeg-dev
 
 if cat /etc/issue | grep -qi Debian; then
-  # Use backports
+  # Get VERSION_CODENAME
   . /etc/os-release
-  apt -y -q install -t $VERSION_CODENAME-backports libaom-dev libheif1 libheif-dev
+  # Use backports
+  apt -y -q install \
+    libaom-dev/$VERSION_CODENAME-backports \
+    libheif1/$VERSION_CODENAME-backports \
+    libheif-dev/$VERSION_CODENAME-backports
 else
   apt -y -q install libaom-dev libheif1 libheif-dev
 fi