diff --git a/mysql-home.patch b/mysql-home.patch
new file mode 100644
index 0000000..054d389
--- /dev/null
+++ b/mysql-home.patch
@@ -0,0 +1,16 @@
+mysql 5.5's new cmake-based build scripts forgot about defining
+DEFAULT_HOME_ENV.  Upstream at http://bugs.mysql.com/bug.php?id=59280
+
+
+diff -Naur mysql-5.5.8.orig/mysys/CMakeLists.txt mysql-5.5.8/mysys/CMakeLists.txt
+--- mysql-5.5.8.orig/mysys/CMakeLists.txt	2010-12-03 12:58:26.000000000 -0500
++++ mysql-5.5.8/mysys/CMakeLists.txt	2011-01-13 11:58:42.583471734 -0500
+@@ -69,6 +69,8 @@
+  SET(MYSYS_SOURCES ${MYSYS_SOURCES} my_port.c)
+ ENDIF()
+ 
++ADD_DEFINITIONS( -DDEFAULT_HOME_ENV=MYSQL_HOME)
++
+ ADD_CONVENIENCE_LIBRARY(mysys ${MYSYS_SOURCES})
+ TARGET_LINK_LIBRARIES(mysys dbug strings ${ZLIB_LIBRARY} 
+  ${LIBNSL} ${LIBM} ${LIBRT})
diff --git a/mysql.spec b/mysql.spec
index d282a0d..223a797 100644
--- a/mysql.spec
+++ b/mysql.spec
@@ -1,6 +1,6 @@
 Name: mysql
 Version: 5.5.8
-Release: 4%{?dist}
+Release: 5%{?dist}
 Summary: MySQL client programs and shared libraries
 Group: Applications/Databases
 URL: http://www.mysql.com
@@ -41,6 +41,7 @@ Patch7: mysql-versioning.patch
 Patch8: mysql-dubious-exports.patch
 Patch9: mysql-disable-test.patch
 Patch10: mysql-embedded-crash.patch
+Patch11: mysql-home.patch
 
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 BuildRequires: gperf, perl, readline-devel, openssl-devel
@@ -179,6 +180,7 @@ the MySQL sources.
 %patch8 -p1
 %patch9 -p1
 %patch10 -p1
+%patch11 -p1
 
 # workaround for upstream bug #56342
 rm -f mysql-test/t/ssl_8k_key-master.opt
@@ -598,6 +600,10 @@ fi
 %{_mandir}/man1/mysql_client_test.1*
 
 %changelog
+* Thu Jan 13 2011 Tom Lane <tgl@redhat.com> 5.5.8-5
+- Fix failure to honor MYSQL_HOME environment variable
+Resolves: #669364
+
 * Thu Jan 13 2011 Tom Lane <tgl@redhat.com> 5.5.8-4
 - Fix crash during startup of embedded mysqld library
 Resolves: #667365