diff --git a/var/spack/repos/builtin/packages/feelpp/package.py b/var/spack/repos/builtin/packages/feelpp/package.py
index 270175a816c30a..58edb69255b7f4 100644
--- a/var/spack/repos/builtin/packages/feelpp/package.py
+++ b/var/spack/repos/builtin/packages/feelpp/package.py
@@ -26,30 +26,26 @@ class Feelpp(CMakePackage):
     version("preset", branch="2284-add-spack-environment-to-the-main-ci")
 
     # Define variants
-    variant("toolboxes", default=False, description="Enable the Feel++ toolboxes")
-    variant("mor", default=False, description="Enable Model Order Reduction (MOR)")
-    variant("python", default=False, description="Enable Python wrappers")
-    variant("quickstart", default=False, description="Enable the quickstart examples")
+    variant("toolboxes", default=True, description="Enable the Feel++ toolboxes")
+    variant("mor", default=True, description="Enable Model Order Reduction (MOR)")
+    variant("python", default=True, description="Enable Python wrappers")
+    variant("quickstart", default=True, description="Enable the quickstart examples")
     variant("tests", default=False, description="Enable the tests")
     
-    # MPI Variants
-    variant("mpi", default="openmpi4", description="Choose MPI version", values=("openmpi4", "openmpi5", "cray-mpich8", "mpich3", "mpich4"), multi=False)
-
     # Add variants for C++ standards
-    variant("cpp17", default=False, description="Use C++17 standard")
-    variant("cpp20", default=True, description="Use C++20 standard")
-    variant("cpp23", default=False, description="Use C++23 standard")
-
-    # Conflicts between C++ standard variants
-    conflicts("+cpp17", when="+cpp20", msg="Cannot enable both C++17 and C++20")
-    conflicts("+cpp17", when="+cpp23", msg="Cannot enable both C++17 and C++23")
-    conflicts("+cpp20", when="+cpp23", msg="Cannot enable both C++20 and C++23")
+    variant(
+        "cxxstd", default="20", description="C++ standard", values=["17", "20", "23"], multi=False
+    )
 
     # Specify dependencies with required versions
+    depends_on("c", type="build")
+    depends_on("cxx", type="build") 
+    depends_on("fortran", type="build")
     depends_on("cmake@3.21:", type="build")
+    depends_on("llvm@14.0.0:")
+    depends_on("mpi")
     depends_on("boost@1.74: +filesystem+iostreams+mpi+multithreaded+shared")
     depends_on("petsc@3.20 +mumps+hwloc+ptscotch +suite-sparse+hdf5 +hypre+kokkos")
-    depends_on("llvm@18:", type="build")
     depends_on("slepc")
     depends_on("cln@1.3.6")
     depends_on("fftw")
@@ -64,13 +60,6 @@ class Feelpp(CMakePackage):
     depends_on("ruby")
     depends_on("gmsh +opencascade+mmg+fltk")
     depends_on("curl")
-    
-    # MPI dependencies
-    depends_on("openmpi@4.0.0:4.999", when="mpi=openmpi4")
-    depends_on("openmpi@5.0.0:5.999", when="mpi=openmpi5")
-    depends_on("cray-mpich@8.0.0:8.999", when="mpi=cray-mpich8")
-    depends_on("mpich@3.0.0:3.999", when="mpi=mpich3")
-    depends_on("mpich@4.0.0:4.999", when="mpi=mpich4")
 
     # Python dependencies if +python variant is enabled
     depends_on("py-pytest", when="+python")
@@ -85,22 +74,13 @@ class Feelpp(CMakePackage):
     depends_on("py-tabulate", when="+python")
     depends_on("py-ipykernel", when="+python")
     depends_on("py-mpi4py", when="+python")
+    depends_on("py-tqdm", when="+python")
     depends_on("python@3.7:", when="+python", type=("build", "run"))
 
-    def get_cpp_version(self):
-        """Helper function to determine the C++ standard preset."""
-        if "+cpp17" in self.spec:
-            return "cpp17"
-        elif "+cpp20" in self.spec:
-            return "cpp20"
-        elif "+cpp23" in self.spec:
-            return "cpp23"
-        else:
-            return "cpp20"  # default
-
     def get_preset_name(self):
-        cpp_version = self.get_cpp_version()
-        preset_name = f"feelpp-clang-{cpp_version}-default-release"
+        spec = self.spec
+        cpp_version = spec.variants["cxxstd"].value
+        preset_name = f"feelpp-clang-cpp{cpp_version}-default-release"
         return preset_name
 
     def cmake_args(self):