Hello, I'm trying to compile cpp code that depends on GiNaC. The code is in this file: https://arxiv.org/src/1912.09099v1/anc/GPLs.cpp and I tried compiling it with the following command: g++ -std=c++11 GPLs.cpp -o GPLs.out -w -lcln -lginac I tried several alternatives for the -std option, but c++11 is the one producing the smallest amount of errors. The output I get is in the attached GPLs.log file. My OS is Mac OS Catalina (10.15.7). My compiler options are as follows: Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1 Apple clang version 12.0.0 (clang-1200.0.32.21) Target: x86_64-apple-darwin19.6.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin I get the very same errors if I use the GNU compiler, but I understand that, under Mac, g++ = gcc = clang. I installed GiNaC through homebrew, and this is the version I have: ginac: stable 1.8.0 (bottled) Not a Computer algebra system https://www.ginac.de/ /usr/local/Cellar/ginac/1.8.0 (66 files, 8.9MB) * Poured from bottle on 2020-12-19 at 16:28:49 From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/ginac.rb License: GPL-2.0 ==> Dependencies Build: pkg-config ✔ Required: cln ✔, python@3.9 ✔, readline ✔ I had also tried to install GiNaC as well as CLN from git, but I get similar errors. I inspected GiNaC's lst header (the constructor producing the errors) but I cannot find anything wrong with it. Any help is greatly appreciated. Beste Grüße, Diego