Comment # 4 on bug 916047 from Stephan Kulow

the problem is that this still will not work as there is a checksums.yaml
within the gem that contains sha1 of .gz files:

/usr/lib64/ruby/gems/2.1.0/cache/checksums.yaml differs (ASCII text)
[   81s] --- old//usr/lib64/ruby/gems/2.1.0/cache/checksums.yaml    2015-11-04
10:29:20.291999678 +0000
[   81s] +++ new//usr/lib64/ruby/gems/2.1.0/cache/checksums.yaml    2015-11-04
10:29:20.299999678 +0000
[   81s] @@ -1,7 +1,7 @@
[   81s]  ---
[   81s]  SHA1:
[   81s] -  metadata.gz: 0c783643dc2194951dead9a193c5bdc0b1cbcb4e
[   81s] -  data.tar.gz: b6eeb7b495cfdd51c29dfa52685e0a228369e7e6
[   81s] +  metadata.gz: 3e32e19f056340f49ae97b4da51ab215e394b550
[   81s] +  data.tar.gz: ea4fa0fa4661f8d4037f2a3086a1fd3a4f358eca
[   81s]  SHA512:
[   81s] -  metadata.gz:
b4a865f530064b8e9f7ae5f04bf566a74dafd1246f2ca38b6c77609b0bd2bf86291e32edda87d10770c8ee0929bffbc27aa20b7ec12711c17206b6337f30fa52
[   81s] -  data.tar.gz:
416eb13806721687369ce4ded4cf942062e5470defe866546599a3645b613ae5ca69f79c2ed9cb36ffd79b3fdb64447f9db3a7d3c3aac6af0dd4dc0a6fec3be4
[   81s] +  metadata.gz:
3667a613e2a813b990f3d1255f71069d4c32d2115a35f2dbce87bab42641b4228101fbd2c8a292f164ed334839732df665ceb00c2b4128d5842c4a225121b1aa
[   81s] +  data.tar.gz:
0f530913f8fd6fbe8704bc78d397299a35ce766cad02d628d20883b602de8cb18883aa34daa145fdf3dddd7f968906dbfddedc26549c110eb1acef55d07f9a32

The fix there should be to get gem to use gzip -n