try to fing gsl and boost

CMakeLists.txt

 CMAKE_MINIMUM_REQUIRED(VERSION 3.11.0 FATAL_ERROR)
 
-if (DEFINED $ENV{SIMPATH})
+if (DEFINED ENV{SIMPATH})
+message(warning "SIMPATH found")
     include(cmake/modules/CMakeListsLegacy.cmake)
   else()
+  message(warning "SIMPATH NOT found")
     set(DISABLE_JSROOT)
+    
     include(cmake/modules/CMakeListsExternal.cmake)
 endif()

cmake/modules/CMakeListsExternal.cmake

@@ -53,7 +53,7 @@ if(NOT DEFINED NICAFEMTO_SUBDIR_BUILD)
       Message(FATAL_ERROR "The used C++ compiler (${CMAKE_CXX_COMPILER}) does not support C++11. NicaFemto can only be compiled with compilers supporting C++11. Please install such an compiler.")
     EndIf()
     
-    target_compile_features(${TARGET_NAME} PRIVATE cxx_std_17)
+    #target_compile_features(${TARGET_NAME} PRIVATE cxx_std_17)
 
 
     Set(LIBRARY_OUTPUT_PATH "${CMAKE_BINARY_DIR}/lib")
@@ -91,15 +91,10 @@ if(NOT DEFINED NICAFEMTO_SUBDIR_BUILD)
         endif()
     Set(Boost_NO_SYSTEM_PATHS TRUE)
     Set(Boost_NO_BOOST_CMAKE TRUE)
-    if(NOT DEFINED NICAFEMTO_BOOST)
-        Message(FATAL_ERROR "Cannot find default path to BOOST, set NICAFEMTO_BOOST")
-    endif()
-    
-    if(NOT DEFINED NICAFEMTO_GLS)
-        Message(FATAL_ERROR "Cannot find default path to GSL, set NICAFEMTO_GSL")
-    endif()
-    Set(BOOST_ROOT ${NICAFEMTO_BOOST})
-    Set(GSL_DIR ${NICAFEMTO_GLS})
+
+
+   # Set(BOOST_ROOT ${NICAFEMTO_BOOST})
+   # Set(GSL_DIR ${NICAFEMTO_GLS})
 
     Message("-- Looking for Boost ...")
       # If an older version of boost is found both of the variables below are
@@ -112,7 +107,10 @@ if(NOT DEFINED NICAFEMTO_SUBDIR_BUILD)
     find_package(Boost 1.48 COMPONENTS program_options thread system timer serialization regex log log_setup filesystem)
     If (Boost_FOUND)
       Set(Boost_Avail 1)
-    Else (Boost_FOUND)
+    Else ()
+        if(NOT DEFINED NICAFEMTO_BOOST)
+            Message(FATAL_ERROR "Cannot find BOOST, set NICAFEMTO_BOOST")
+        endif()
       Set(Boost_Avail 0)
     EndIf (Boost_FOUND)
 
@@ -121,12 +119,14 @@ if(NOT DEFINED NICAFEMTO_SUBDIR_BUILD)
         if(NOT GSL_FOUND)
           if(APPLE)
             set(GSL_DIR /usr/local)
-          else()
-            unset(GSL_DIR)
+          else()   
+            if(NOT DEFINED NICAFEMTO_GLS)
+                Message(FATAL_ERROR "Cannot find default path to GSL, set NICAFEMTO_GSL")
+            endif()
           endif()
-          find_package(GSL REQUIRED)
+          #find_package(GSL REQUIRED)
         endif()
-    Find_Package(FairLogger)
+    Find_Package(FairLogger REQUIRED)
     Find_Package(FairMQ)  
   
     SetBasicVariables()