diff --git a/mysql-missing-header.patch b/mysql-missing-header.patch
new file mode 100644
index 0000000..be07cc1
--- /dev/null
+++ b/mysql-missing-header.patch
@@ -0,0 +1,105 @@
+From: Date: August 24 2010 3:48pm
+Subject: bzr commit into mysql-5.1-bugteam branch (davi:3489) Bug#55846
+List-Archive: http://lists.mysql.com/commits/116644
+X-Bug: 55846
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary="===============1139944217595210815=="
+
+--===============1139944217595210815==
+MIME-Version: 1.0
+Content-Type: text/plain; charset="us-ascii"
+Content-Transfer-Encoding: 7bit
+Content-Disposition: inline
+
+# At a local mysql-5.1-bugteam repository of davi
+
+ 3489 Davi Arnaut	2010-08-24
+      Bug#55846: Link tests fail on Windows - my_compiler.h missing
+      
+      Make the my_compiler.h header, like my_attribute.h, part of
+      the distribution. This is required due to the dependency of
+      the former on the latter (which can undefine __attribute__).
+
+    modified:
+      include/Makefile.am
+      scripts/make_win_bin_dist
+=== modified file 'include/Makefile.am'
+--- a/include/Makefile.am	2010-07-14 12:27:13 +0000
++++ b/include/Makefile.am	2010-08-24 13:48:45 +0000
+@@ -26,7 +26,8 @@ pkginclude_HEADERS =	$(HEADERS_ABI) my_d
+ 			decimal.h errmsg.h my_global.h my_net.h \
+ 			my_getopt.h sslopt-longopts.h my_dir.h \
+ 			sslopt-vars.h sslopt-case.h sql_common.h keycache.h \
+-			m_ctype.h my_attribute.h $(HEADERS_GEN_CONFIGURE) \
++			m_ctype.h my_attribute.h my_compiler.h \
++			$(HEADERS_GEN_CONFIGURE) \
+ 			$(HEADERS_GEN_MAKE)
+ 
+ noinst_HEADERS =	config-win.h config-netware.h my_bit.h \
+@@ -37,7 +38,7 @@ noinst_HEADERS =	config-win.h config-net
+ 			my_aes.h my_tree.h my_trie.h hash.h thr_alarm.h \
+ 			thr_lock.h t_ctype.h violite.h my_md5.h base64.h \
+ 			my_handler.h my_time.h my_vle.h my_user.h \
+-			my_libwrap.h my_stacktrace.h my_compiler.h
++			my_libwrap.h my_stacktrace.h
+ 
+ EXTRA_DIST =        mysql.h.pp mysql/plugin.h.pp
+ 
+
+=== modified file 'scripts/make_win_bin_dist'
+--- a/scripts/make_win_bin_dist	2009-11-17 16:53:45 +0000
++++ b/scripts/make_win_bin_dist	2010-08-24 13:48:45 +0000
+@@ -263,6 +263,7 @@ cp include/mysql.h \
+    include/keycache.h \
+    include/m_ctype.h \
+    include/my_attribute.h \
++   include/my_compiler.h \
+    include/mysqld_error.h \
+    include/sql_state.h \
+    include/mysqld_ername.h \
+
+
+--===============1139944217595210815==
+MIME-Version: 1.0
+Content-Type: text/bzr-bundle; charset="us-ascii";
+	name="bzr/davi.arnaut@stripped"
+Content-Transfer-Encoding: 7bit
+Content-Disposition: inline
+
+# Bazaar merge directive format 2 (Bazaar 0.90)
+# revision_id: davi.arnaut@stripped
+# target_branch: file:///home/davi/bzr/bugs/55846-5.1/
+# testament_sha1: a436a03b0f660a8b69093e88fe1377a743d53b3b
+# timestamp: 2010-08-24 10:48:54 -0300
+# base_revision_id: mattias.jonsson@stripped\
+#   mk1a4rux131hao8r
+# 
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+
+--===============1139944217595210815==--
diff --git a/mysql.spec b/mysql.spec
index 4a16e96..cd9743b 100644
--- a/mysql.spec
+++ b/mysql.spec
@@ -1,6 +1,6 @@
 Name: mysql
 Version: 5.1.50
-Release: 1%{?dist}
+Release: 2%{?dist}
 Summary: MySQL client programs and shared libraries
 Group: Applications/Databases
 URL: http://www.mysql.com
@@ -44,6 +44,7 @@ Patch13: mysql-expired-certs.patch
 Patch14: mysql-missing-string-code.patch
 Patch15: mysql-lowercase-bug.patch
 Patch16: mysql-chain-certs.patch
+Patch17: mysql-missing-header.patch
 
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 BuildRequires: gperf, perl, readline-devel, openssl-devel
@@ -184,6 +185,7 @@ the MySQL sources.
 %patch14 -p1
 %patch15 -p1
 %patch16 -p1
+%patch17 -p1
 
 # workaround for upstream bug #56342
 rm -f mysql-test/t/ssl_8k_key-master.opt
@@ -577,6 +579,10 @@ fi
 %{_mandir}/man1/mysql_client_test.1*
 
 %changelog
+* Sat Aug 28 2010 Tom Lane <tgl@redhat.com> 5.1.50-2
+- Include my_compiler.h in distribution, per upstream bug #55846.
+  Otherwise PHP, for example, won't build.
+
 * Sat Aug 28 2010 Tom Lane <tgl@redhat.com> 5.1.50-1
 - Update to MySQL 5.1.50, for various fixes described at
   http://dev.mysql.com/doc/refman/5.1/en/news-5-1-50.html