Missing autoconf macro

Author: matthiasblaesing

.github/workflows/ci.yaml

@@ -36,7 +36,7 @@ jobs:
           distribution: 'zulu'
       - name: Linux requirements
         if: contains(matrix.os, 'ubuntu')
-        run: sudo apt-get -y install texinfo
+        run: sudo apt-get -y install texinfo libltdl-dev
       - name: macOS requirements
         if: contains(matrix.os, 'macos')
         run: |