Another try

Author: jay-tux

.github/workflows/c-cpp.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+    - name: update
+      run: sudo apt install g++11 libstdc++11-dev
     - name: Install Conan
       id: conan
       uses: turtlebrowser/get-conan@main

Makefile

@@ -8,7 +8,7 @@ INCL_PATH=$(abspath ./inc)
 DOC_DIR=$(abspath ./docs/)
 
 CC=g++
-CXXARGS=-I$(abspath ./inc) -g -c -std=c++2a -MMD
+CXXARGS=-I$(abspath ./inc) -g -c -std=c++20 -MMD
 LDARGS=
 
 all: