A test is failing on big endian platforms like ppc and s390

from build.log
...
See 'Writing portable packages' in the 'Writing R Extensions' manual.
* checking installed files from 'inst/doc' ... OK
* checking examples ... OK
* checking for unstated dependencies in tests ... OK
* checking tests ...
  Running 'IRanges_unit_tests.R'
 ERROR
Running the tests in 'tests/IRanges_unit_tests.R' failed.
Last 13 lines of output:
  IRanges RUnit Tests - 137 test functions, 0 errors, 1 failure
  FAILURE in test_Rle_runsum_real: Error in checkIdentical(target1, current) : FALSE 
  
  Test files with failing tests
  
     test_Rle.R 
       test_Rle_runsum_real 
  
  
  Error in BiocGenerics:::testPackage("IRanges") : 
    unit tests failed for package IRanges
  Calls: <Anonymous> -> <Anonymous>
  Execution halted
RPM build errors:


Version-Release number of selected component (if applicable):
R-IRanges-1.18.0-2.fc19.1

for full logs please see http://s390.koji.fedoraproject.org/koji/taskinfo?taskID=1102340 or http://ppc.koji.fedoraproject.org/koji/taskinfo?taskID=1231584