Remove extra vars

Author: IsabelParedes

CMakeLists.txt

@@ -58,8 +58,6 @@ option(XEUS_R_USE_SHARED_XEUS "Link xr  with the xeus shared library (instead of
 option(XEUS_R_USE_SHARED_XEUS_R "Link xr  with the xeus-r shared library (instead of the static library)" ON)
 option(XEUS_R_EMSCRIPTEN_WASM_BUILD "Build for wasm with emscripten" OFF)
 
-option(INSTALL_HERA "Install the hera R package" ON)
-
 if(EMSCRIPTEN)
     add_compile_definitions(XEUS_R_EMSCRIPTEN_WASM_BUILD)
     message("Build with emscripten")
@@ -97,7 +95,7 @@ message(STATUS "R_SCRIPT_COMMAND = ${R_SCRIPT_COMMAND}")
 # ======================
 
 # When cross-compiling, hera should be installed before building the project
-if(NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "${CMAKE_HOST_SYSTEM_NAME}")
+if(XEUS_R_CROSS_COMPILING)
     if(NOT EXISTS "${R_HOME}/library/hera")
         message(FATAL_ERROR "R 📦 hera is not installed")
     endif()