--- seamonkey.spec-2.4x	2019-12-01 21:10:14.116559646 +0300
+++ seamonkey.spec	2020-03-02 17:06:13.740813262 +0300
@@ -14,8 +14,8 @@
 %define sm_develdir     %sm_prefix-devel
 
 Name: 	 seamonkey
-Version: 2.49.5
-Release: alt2
+Version: 2.53.1
+Release: alt1
 Epoch:   1
 
 Summary: Web browser and mail reader
@@ -85,7 +85,8 @@
 %if_with system_mozldap
 BuildPreReq: mozldap-devel
 %endif
-BuildRequires: gcc-c++ libdnet-devel libgtk+2-devel libIDL-devel wget libarchive-devel lbzip2 libpixman-devel
+BuildRequires: rust rust-cargo /proc
+BuildRequires: gcc-c++ libdnet-devel libgtk+2-devel libgtk+3-devel libIDL-devel wget libarchive-devel lbzip2 libpixman-devel
 BuildRequires: libjpeg-devel libpng-devel libXinerama-devel libXext-devel
 BuildRequires: libXp-devel libXt-devel makedepend net-tools unzip libalsa-devel yasm libwireless-devel
 BuildRequires: xorg-cf-files zip libXft-devel libvpx-devel
@@ -162,14 +163,16 @@
 %endif
 
 %patch0 -p1
-%patch1 -p1
+# fails to apply against 2.53.1
+#patch1 -p1
 %patch2 -p1
 %patch3 -p1
 %if_with system_mozldap
 %patch5 -p1 -b .mozldap
 %endif
 %patch6 -p2
-%patch7 -p2
+# fails to apply against 2.53.1
+#patch7 -p2
 #%%patch8 -p2
 #patch9 -p2
 
@@ -181,11 +184,14 @@
 %endif
 
 ### roll back a changeset breaking gtk2 compatibility (cf. https://bugzilla.mozilla.org/show_bug.cgi?id=1461307)
-%patch11 -p0
+# cairo-gtk2 is unsupported build target as of 2.53.1
+#patch11 -p0
 ### don't link against crmf when using system NSS (cf. https://bugzilla.mozilla.org/show_bug.cgi?id=1371991)
-%patch12 -p0
+# fails to apply against 2.53.1
+#patch12 -p0
 ### temporary fix: protection against dereferencing an invalid pointer in js::ProxyObject::New():
-%patch13 -p0
+# fails to apply against 2.53.1
+#patch13 -p0
 
 ### Copying .mozconfig to build directory
 cp -f %SOURCE7 .mozconfig
@@ -219,9 +225,11 @@
 
 # On x86 architectures, Mozilla can build up to 4 jobs at once in parallel,
 # however builds tend to fail on other arches when building in parallel.
+# 2.53.1: let's at least try 8 on x86
 %ifarch %ix86 x86_64
 [ "%__nprocs" -ge 2 ] && MOZ_SMP_FLAGS=-j2
 [ "%__nprocs" -ge 4 ] && MOZ_SMP_FLAGS=-j4
+[ "%__nprocs" -ge 8 ] && MOZ_SMP_FLAGS=-j8
 %endif
 
 # a kludge since 2.26 ...
@@ -467,6 +475,12 @@
 %_sysconfdir/rpm/macros.d/%name
 
 %changelog
+* Fri Feb 28 2020 Michael Shigorin <mike@altlinux.org> 1:2.53.1-alt1
+- 2.53.1
+  + backup user profile(s) and see the release notes:
+    http://www.seamonkey-project.org/releases/seamonkey2.53.1/
+  + cairo-gtk3 build (gtk2 is unsupported now)
+
 * Sun Dec 01 2019 Michael Shigorin <mike@altlinux.org> 1:2.49.5-alt2
 - applied ftbfs patches by Oleg Zenin (fixes: #37449)