Use packaged autoconf and automake

Author: hmelder

.github/workflows/ci.yml

@@ -33,18 +33,7 @@ jobs:
           if [ "$RUNNER_OS" = "macOS" ]; then
             brew install cmake autoconf automake libtool pkg-config
           elif [ "$RUNNER_OS" = "Linux" ]; then
-            sudo apt-get install curl cmake make libtool pkg-config texinfo
-
-            # install autoconf 2.71 from source (required by libffi, not available via apt-get on Ubuntu focal)
-            wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.71.tar.xz
-            tar -xf autoconf-2.71.tar.xz
-            cd autoconf-2.71 && ./configure --prefix=/usr/ && make && sudo make install
-            autoconf --version
-
-            wget http://ftp.gnu.org/gnu/automake/automake-1.16.4.tar.xz
-            tar -xf automake-1.16.4.tar.xz
-            cd automake-1.16.4 && ./configure --prefix=/usr/ && make && sudo make install
-            automake --version
+            sudo apt-get install cmake make libtool autoconf automake pkg-config texinfo
           else
             echo Unsupported OS $RUNNER_OS
             exit 1