add ifdef and comment

Author: JorgeG94

src/testdrive.F90

@@ -285,7 +285,12 @@ end subroutine test_interface
   abstract interface
     !> Collect all tests
     subroutine collect_interface(testsuite)
+#ifdef __NVCOMPILER_LLVM__
+      ! this is only an issue with nvhpc 25.9, possibly a bug in the compiler ! verify in next release
       import :: unittest_type, test_interface
+#else
+      import :: unittest_type
+#endif
 
       !> Collection of tests
       type(unittest_type), allocatable, intent(out) :: testsuite(:)