trying to set path to compilers by hand

.gitlab-ci.yml

@@ -18,6 +18,9 @@ variables:
     - export ROOTSYS=$SIMPATH
     - export PATH=$SIMPATH/bin:$PATH
     - export LD_LIBRARY_PATH=$SIMPATH/lib:$SIMPATH/lib/root:$LD_LIBRARY_PATH
+    - export CXX=`fairsoft-config --cxx`
+    - export CC=`fairsoft-config --cc`
+    - export FC=`fairsoft-config --f77`
     - mkdir build
     - cd build
     - cmake -DCMAKE_INSTALL_PREFIX=../inst ..

cmake/modules/CMakeListsExternal.cmake

@@ -54,6 +54,12 @@ if(NOT DEFINED NICAFEMTO_SUBDIR_BUILD)
     EndIf()
     
     #target_compile_features(${TARGET_NAME} PRIVATE cxx_std_17)
+    
+        If(NOT _HAS_CXX17_FLAG)
+      Message(FATAL_ERROR "The used C++ compiler (${CMAKE_CXX_COMPILER}) does not support C++17. NicaFemto can only be compiled with compilers supporting C++11. Please install such an compiler.")
+      else()
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")      
+    EndIf()
 
 
     Set(LIBRARY_OUTPUT_PATH "${CMAKE_BINARY_DIR}/lib")