relion@5.0.1: ctffind dependency missing version constraint

[vphan13]

Description

The relion package has an unconditional dependency on ctffind@:4 (line 107) that applies to all RELION versions, causing concretization failures for RELION 5.0.1.

Steps to Reproduce

   spack install relion@5.0.1 +cuda cuda_arch=61 +double +gui purpose=cluster

Error

   Cannot select a single "version" for package "relion"
   Cannot satisfy 'relion@:4' 2(5.0.1)

Root Cause

Line 107 in packages/relion/package.py:

   depends_on("ctffind@:4", type="run")

This dependency has no when clause, so it applies to ALL relion versions including 5.0.1, creating a conflict with line 106:

   depends_on("ctffind@4.1:4", type="run", when="@5")

Proposed Fix

Add a version constraint to line 107:

   depends_on("ctffind@:4", type="run", when="@:4")

Environment

• Spack version: 1.1 (releases/v2025.11)
• OS: Rocky Linux 9
• Compiler: gcc@11.5.0

Additional Context

This issue affects RELION 5.x installations. The fix ensures that:

• RELION ≤4.x uses ctffind@:4
• RELION 5.x uses the more specific ctffind@4.1:4