$ git diff --patch-with-stat --summary 7a14f952c033d3c5dfca84c437dc51e94497b423..c3274076265ba474618d7c41dfd4b632bf747b54

 .abf.yml         | 103 +++++++++++++++++++++++++++----------------------------
 thunderbird.spec |  16 +++++----
 2 files changed, 61 insertions(+), 58 deletions(-)

diff --git a/.abf.yml b/.abf.yml
index 3e7e728..582b151 100644
--- a/.abf.yml
+++ b/.abf.yml
@@ -1,53 +1,52 @@
 sources:
-  ar.xpi: 3c053e4319dc78bdb2d23f82262cd2daa6ec593d
-  ast.xpi: c9c779ea5816012715cb1d6267faff109b3ff125
-  be.xpi: 38f33975895a6f1fa213d729b3e8c28ac7586b98
-  bg.xpi: d82314d73c74b03d4f85e5949dc77134207bdb21
-  br.xpi: da06a89bf5f6ab13f83b2def97cca32a646a61c2
-  ca.xpi: bc66d408a7fc2d6d78757038afd95c5e8ab13320
-  cs.xpi: b3c97e480b905cd8c4f0266212965be583cb89b6
-  da.xpi: 80c9582b5553a0cc4de98b1aa02dbe26099d803f
-  de.xpi: a11c47d2f22e6b2bf6ab0dd260ac73704d204bb2
-  el.xpi: 3aa1547ca7a3b44148d31a6da7ce3605cf1ed44a
-  en-GB.xpi: 2f4538296a0545d70a1cd8813b2c1e233fa36675
-  en-US.xpi: 7e610da5c8b5962a332765a95077218deb73ed58
-  es-AR.xpi: 76c75f6e94c8b07923d1754f67e77c8a617e22f4
-  es-ES.xpi: 93fe1898043a60e29faba277ca3fbd557ead5cd2
-  et.xpi: 705d6c567c301bb6fc957a2a7ed5d9cf23d9c134
-  eu.xpi: f08fc759ebd1b5b44d3b07e9ac264930bcf52be6
-  fi.xpi: df203d2e17fc649c7636bd7cd5166872fe57ebad
-  fr.xpi: af7ca9f0931e70333e133f306fd38d015142044d
-  fy-NL.xpi: 2d107727df80026dc3443f38619b3b966776b524
-  ga-IE.xpi: 58134eb6f72180180b8f1d370b0872b31d11c9c3
-  gd.xpi: dd0a3aa59b630739de0c7b7333426eda74e3df19
-  gl.xpi: d4c1e480ffa709fb51f316ad3c33cb036c2decd1
-  he.xpi: b7a4fdc7e03d6ae705a82ab96139d36101dd9061
-  hr.xpi: 08e4eaf843f463c9419abfe8586f555894eb5e2b
-  hu.xpi: c4d80807715f54447467078f23c7452d1352e9ba
-  hy-AM.xpi: 75aecaba58e9eba6a290fb42bac063630a63ac3e
-  id.xpi: 82dac351f5264d90bfdd6b45748a3ea656e82949
-  is.xpi: 7bca2c2ec081c6545f92ad8cdf2ce7643c275f4e
-  it.xpi: 82afbc170f3ded69aab2064c0c863e75128a1dfa
-  ja.xpi: 39c38051aac26176102f902ca76bd15166c59124
-  ko.xpi: 58bd3334004f3d0595bb205fa37dd0098db6b1d7
-  lt.xpi: 17c148ae6f12d6133ff1e827f5f563aed5d1879f
-  nb-NO.xpi: ea93575aa0fbce948a270bec177a42d2df5a6de5
-  nl.xpi: 4b0c7cbdff35d376d525e430fd71090c7537d451
-  nn-NO.xpi: 4a6cb51a4d61465cd8f3b6b0e83197edf0ad6751
-  pl.xpi: 8f1d9c669903dfcf7ec463117c27036480136cd9
-  pt-BR.xpi: 1b6594f1b8148eadf921928ab336e28a6c30685e
-  pt-PT.xpi: 02aadc0917e4146022bcd5ebd3cf89150d5b2c48
-  ro.xpi: 559ecbde3bf5967f02eb2b5c9f14cccdd887b7ea
-  ru.xpi: 495d5c28836e229dfaebb0dd322654bc4d9619b8
-  si.xpi: 72483a61e8584e411483b746c7b0ae476dd764de
-  sk.xpi: 1f45ed8324182f44ac6dd83d66465ef7c72ba058
-  sl.xpi: 224feb2905f004effc868feb192cfa1be6b5ea42
-  sq.xpi: 4a9e2c4b241e00bd5069f1dcef4e1593530f01ba
-  sr.xpi: 5474343de39720d818d9eaa300e498ebf4cbc8ff
-  sv-SE.xpi: d9e722b2b041a28f4000ce0125b447f4d2b3e7b4
-  thunderbird-78.12.0.source.tar.xz: 98228bff32bf6cb7e0e34eb135a800d3200881c1
-  tr.xpi: c34ac62c2c26462a1fdbabc5db5ae948591106c0
-  uk.xpi: 6b669a90263bdabd6799edbd62f3303390264bdb
-  vi.xpi: 43ec05ab3f6cd1b13d8735176d58bc9a5cf3597d
-  zh-CN.xpi: 57e8c512aab0ed97fc382ada062b9b043df733a8
-  zh-TW.xpi: d14daa3c7622156f1a46952a41b5ba53fcb59b65
+  ar.xpi: 08b333580c8d454f1dff0c8cd8252c7c34b5163d
+  ast.xpi: 890479545c23c6f1b0aa47114d7b261a6f71b5a8
+  be.xpi: 954d1ff708a4f30387a1c2ae12121bf7d3ea1ff4
+  bg.xpi: e0f187ca9485a4c6bc6469a7c215c6b15f62f509
+  br.xpi: 77fab9cf29ba94526deb9d00f350913c4d1ee5ca
+  ca.xpi: 3077348264db78be0e11f8cc58a17d16f05ba584
+  cs.xpi: 0a0b5496fc845186e571b75ff261cd6acd4cc29b
+  da.xpi: fb2cff710eb15c310fd2e4982e4d79a77cd3821d
+  de.xpi: 58cfa671e4ca9555092749afd89332c8a8cd8b65
+  el.xpi: ddf899a11d4ca2482097ed974b6afd17d5a23bee
+  en-GB.xpi: c6df8c2c5454db8d956528feb82afc7f44db94c9
+  en-US.xpi: ab51dcef46c4f75934191b75a5876779c5e7b2ee
+  es-AR.xpi: a414ab000570ff17ddda01ef1fbb1074c10bf91d
+  es-ES.xpi: 869d417806bd361e8963102835cf2fcb1cf47b9e
+  et.xpi: 191249885d8f7426e3fb4470e4698a74244dd74e
+  eu.xpi: 8e284662680f6392b1bdc86b87e6098a66839cbf
+  fi.xpi: 3e9c687cecca3dc5c47fa95c29b0f5cc0db103f4
+  fr.xpi: 10dcf4645ad71c5f9eb06334127caa02348558df
+  fy-NL.xpi: e6aeb696fa984a494198315e89deb90ccb143da6
+  ga-IE.xpi: 853b6543e90d271f2065431f6fdef3ee68a60c75
+  gd.xpi: c21fe5f710b17b534a5772bdf078f41d30b91d8d
+  gl.xpi: 68711b4d34afddd4bf821c663db7244d0981d70e
+  he.xpi: 1a99cd293e359d44b698e237fb2f67464489b124
+  hr.xpi: 55512ab3c1d1297717253145b349cbb9b47efd7b
+  hu.xpi: 4d91e25f8eabf6e1a4a0d9724684f3276b7b4cb1
+  hy-AM.xpi: d72965fb08bc8dd2f6ea5c6480b776b8ab899922
+  id.xpi: 96108fd642c56652861035d787666f79f17dcaf6
+  is.xpi: 4a6e3d16b77fabf6e80246a61389e1bf8858c312
+  it.xpi: ad4a286358d32c86999fa0a70d0865d6a7280d41
+  ja.xpi: 606499cb6c90402c89bb450f02d606989b3bcba3
+  ko.xpi: 063f79cbc7f932131147c4e8bf43768d8539fb22
+  lt.xpi: 10533a6a2264e6d1f8ce38a7b2cd2333ab8c781a
+  nb-NO.xpi: f41e80f9dad10b404ae69a7a986556ca454747cf
+  nl.xpi: 1ddf730bcbca46f498062b6214211fd81241d0db
+  nn-NO.xpi: f076c03556bf7b89888a8a34ada9cf295939accc
+  pl.xpi: d6f61d025029b8992d23cbaa91635a90bffa65cd
+  pt-BR.xpi: c699edabfea5ef7f67d2107f70c697720cb937b1
+  pt-PT.xpi: 8b9b93da4a6083dfb59a08e1a20fb84bd6b432a2
+  ro.xpi: 87ab88a8293f919c4e01a6d6b6672b6694006a69
+  ru.xpi: 4fa4978f85255a2fe53987f826952d12dfcc0f03
+  sk.xpi: 5e4eb3ef3d07029b5f564eed4f01dff5a340da5f
+  sl.xpi: ae117f65f356372d62829cd778ce9fdc3c32a652
+  sq.xpi: e46ca10620ddb982b28fca832888018fa4ee884f
+  sr.xpi: 9de028d9f63abe526558ee53e0687c433c36a617
+  sv-SE.xpi: 72c6e3a0f05f9dc780f18c87305c39c779359f89
+  thunderbird-91.0.source.tar.xz: c55b61c7b22d0de0f281d3752ab3d67454a474c3
+  tr.xpi: d52880ea4a00644e36db4029aa929587225d11be
+  uk.xpi: 88ad8b4218cd03407a89c291a969de5fe015d634
+  vi.xpi: f7dfd290ca61632a9d9a55b16fd32ba8e861ae57
+  zh-CN.xpi: 3a630d12a389ba1bedd71371ddfe975c3dd169a3
+  zh-TW.xpi: 8f1983514697cc93b769a39dab1aa3e4b968fd83
diff --git a/thunderbird.spec b/thunderbird.spec
index 93a3b62..4790c10 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -47,7 +47,7 @@
 %define xpidir http://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/%{version}/linux-x86_64/xpi/
 
 # Supported l10n language lists
-%define langlist  ar ast be bg br ca cs da de el en_GB en_US es_AR es_ES et eu fi fr fy ga gd gl he hr hu hy id is it ja ko lt nb_NO nl nn_NO pl pt_BR pt_PT ro ru si sk sl sq sr sv_SE tr uk vi zh_CN zh_TW
+%define langlist  ar ast be bg br ca cs da de el en_GB en_US es_AR es_ES et eu fi fr fy ga gd gl he hr hu hy id is it ja ko lt nb_NO nl nn_NO pl pt_BR pt_PT ro ru sk sl sq sr sv_SE tr uk vi zh_CN zh_TW
 
 # Disabled l10n languages, for any reason
 %define disabled_langlist gu_IN mk sr af rm
@@ -201,7 +201,7 @@
 
 Summary:	Full-featured email, RSS, and newsgroup client
 Name:		thunderbird
-Version:	78.12.0
+Version:	91.0
 Release:	1
 License:	MPL
 Group:		Networking/Mail
@@ -386,7 +386,6 @@ mk_add_options BUILD_OFFICIAL=1
 #mk_add_options MOZ_MAKE_FLAGS="%{_smp_mflags}"
 mk_add_options MOZ_OBJDIR=`pwd`/%{objdir}
 ac_add_options --enable-application=comm/mail
-ac_add_options --enable-calendar
 ac_add_options --prefix="%{_prefix}"
 ac_add_options --libdir="%{_libdir}"
 ac_add_options --with-system-nspr
@@ -428,11 +427,17 @@ ac_add_options --enable-optimize="-O2"
 %endif
 EOF
 
+export MACH_USE_SYSTEM_PYTHON=1
+export MACH_NO_WRITE_TIMES=1
+
 ./mach build
 
 #===============================================================================
 
 %install
+
+export MACH_USE_SYSTEM_PYTHON=1
+
 mkdir -p %{buildroot}{%{_libdir},%{_bindir},%{_datadir}/applications}
 mkdir -p %buildroot%tbdir
 
@@ -541,9 +546,8 @@ fi
 #===============================================================================
 
 %files
-%doc LEGAL
-%attr(755,root,root) %{_bindir}/thunderbird
-%attr(644,root,root) %{_datadir}/applications/*.desktop
+%{_bindir}/thunderbird
+%{_datadir}/applications/*.desktop
 %{tbdir}
 %if %{xpi}
 %dir %{tbextdir}