before_install_linux.sh in rmagick-5.2.0 vs before_install_linux.sh in rmagick-5.3.0

@@ -22,11 +22,11 @@
 sudo apt-get autoremove -y imagemagick* libmagick* --purge
 
 # install build tools, ImageMagick delegates
 sudo apt-get install -y build-essential libx11-dev libxext-dev zlib1g-dev \
   liblcms2-dev libpng-dev libjpeg-dev libfreetype6-dev libxml2-dev \
-  libtiff5-dev libwebp-dev liblqr-1-0-dev vim gsfonts ghostscript ccache
+  libtiff5-dev libwebp-dev liblqr-1-0-dev vim gsfonts ghostscript
 
 if [ ! -d /usr/include/freetype ]; then
   # If `/usr/include/freetype` is not existed, ImageMagick 6.7 configuration fails about Freetype.
   sudo ln -sf /usr/include/freetype2 /usr/include/freetype
 fi
@@ -50,10 +50,10 @@
   if [ -v CONFIGURE_OPTIONS ]; then
     options="${CONFIGURE_OPTIONS} ${options}"
   fi
 
   cd "${build_dir}"
-  CC="ccache cc" CXX="ccache c++" ./configure --prefix=/usr "${options}"
+  ./configure --prefix=/usr "${options}"
   make -j
 }
 
 if [ ! -d "${build_dir}" ]; then
   build_imagemagick