before_install_linux.sh in rmagick-4.0.0 vs before_install_linux.sh in rmagick-4.1.0.rc1

@@ -38,10 +38,14 @@
 
 build_imagemagick() {
   mkdir -p build-ImageMagick
 
   version=(${IMAGEMAGICK_VERSION//./ })
-  if (( "${version[0]}${version[1]}" >= 69 )); then
+  if (( "${version[0]}" >= 7 )); then
+    wget https://github.com/ImageMagick/ImageMagick/archive/${IMAGEMAGICK_VERSION}.tar.gz
+    tar -xf ${IMAGEMAGICK_VERSION}.tar.gz
+    mv ImageMagick-${IMAGEMAGICK_VERSION} $build_dir
+  elif (( "${version[0]}${version[1]}" >= 69 )); then
     wget https://github.com/ImageMagick/ImageMagick6/archive/${IMAGEMAGICK_VERSION}.tar.gz
     tar -xf ${IMAGEMAGICK_VERSION}.tar.gz
     rm ${IMAGEMAGICK_VERSION}.tar.gz
     mv ImageMagick6-${IMAGEMAGICK_VERSION} $build_dir
   else