fix: gettext: require: +libxml2

spack-environment/packages.yaml

@@ -144,6 +144,9 @@ packages:
     - '@11.2.2.east'
     - cxxstd=20 -vecgeom +threads -vtk
     - any_of: [+opengl +qt +x11, -opengl -qt -x11]
+  gettext: 
+    require:
+    - +libxml2
   gl:
     require:
     - glx