diff --git a/thunderbird.spec b/thunderbird.spec
index e114d47..4112e0b 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -10,13 +10,13 @@
 %define        source_dir                  comm-esr%(echo %version | cut -d. -f1)
 
 Name:          thunderbird
-Version:       38.4.0
+Version:       38.5.1
 Release:       1mamba
 Summary:       Mozilla Thunderbird email, RSS, and newsgroup client
 Group:         Graphical Desktop/Applications/Internet
 Vendor:        openmamba
 Distribution:  openmamba
-Packager:      Automatic Build System <autodist@mambasoft.it>
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           http://www.mozilla.org/projects/thunderbird/
 Source0:       http://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/%{version}/source/thunderbird-%{version}.source.tar.bz2
 # wget ftp://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/3.1/linux-i686/xpi/*.xpi
@@ -142,9 +142,8 @@ Because the project is small and tightly managed, bugs targeted to a particular
 This package contains static libraries and header files need for development.
 
 %prep
-%setup -q -c -D -T
-:<< ___EOF
-
+%setup -q -c
+#-D -T
 %define _use_internal_dependency_generator 0
 
 %define __find_provides %{_builddir}/thunderbird-%{version}/find_provides.sh
@@ -161,11 +160,16 @@ cat > %{_builddir}/thunderbird-%{version}/find_requires.sh <<_EOF
 #! /bin/sh
 %{_prefix}/lib/rpm/find-requires %{buildroot} %{_target_cpu} 2>/dev/null |
 while read line; do
-   [ ! -f %{buildroot}%{tbdir}/\$line -a ! -f %{buildroot}%{_libdir}/thunderbird-devel-%{majversion}/\$line ] && echo "\$line"
+%ifarch x86_64
+   sofile="\${line/\(*}"
+%endif
+   [ ! -f %{buildroot}%{tbdir}/\$sofile -a ! -f %{buildroot}%{_libdir}/thunderbird-devel-%{majversion}/\$sofile ] && echo "\$line"
 done
 _EOF
 chmod +x %{_builddir}/thunderbird-%{version}/find_requires.sh
 
+#:<< ___EOF
+
 cd %{source_dir}
 
 #%patch0 -p1
@@ -264,8 +268,7 @@ echo "export MOZ_DEBUG_SYMBOLS="1"" >> .mozconfig
 #__EOF
 
 %build
-:<< __EOF
-
+#:<< _EOF
 cd %{source_dir}
 ## Disable C++ exceptions since Mozilla code is not exception-safe
 #MOZ_OPT_FLAGS=$(echo "$RPM_OPT_FLAGS" | \
@@ -293,6 +296,9 @@ export MOZILLA_OFFICIAL=1
 #export MOZ_PHOENIX="1"
 
 make -f client.mk build
+# 38.5.0: not a mistake
+make -f client.mk build
+
 #\
 #   NSS_LIBS="`pkg-config --libs nss` -lcrmf" \
 #   NSS_CFLAGS="`pkg-config --cflags nss`"
@@ -1236,6 +1242,9 @@ Chinese (Traditional) language support for Thunderbird.
 %{tbdir}/extensions/langpack-zh-TW@thunderbird.mozilla.org/
 
 %changelog
+* Sat Jan 23 2016 Automatic Build System <autodist@mambasoft.it> 38.5.1-1mamba
+- automatic version update by autodist
+
 * Fri Nov 27 2015 Automatic Build System <autodist@mambasoft.it> 38.4.0-1mamba
 - automatic version update by autodist