Dear authors of PPL, I have following compilation error for Parma Polyhedral Library 1.2 on Macintosh: ./OR_Matrix_inlines.hh:100:8: error: missing 'typename' prior to dependent type template name 'OR_Matrix<T>::Pseudo_Row' inline OR_Matrix<T>::Pseudo_Row<U>& (base) ➜ ppl-1.2 g++ -v Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1 Apple clang version 11.0.3 (clang-1103.0.32.59) Target: x86_64-apple-darwin20.1.0 Thread model: posix InstalledDir: /Library/Developer/CommandLineTools/usr/bin -------- I originally send my bugreport to support@bugseng.com and Roberto Bagnara told me that this error is likely corrected long ago on the git repository. I tried compiling that one. I get an error in "src/BUGS.cc" with BUGS.cc:25:3: error: use of undeclared identifier 'nullptr' -------- Let me know how I can help you fixing those issues. Mathieu