diff --git a/gcc6.patch b/gcc6.patch
new file mode 100644
index 0000000..13ab478
--- /dev/null
+++ b/gcc6.patch
@@ -0,0 +1,79 @@
+Index: src/main/cpp/objectoutputstream.cpp
+===================================================================
+--- src/main/cpp/objectoutputstream.cpp.orig
++++ src/main/cpp/objectoutputstream.cpp
+@@ -36,8 +36,8 @@ ObjectOutputStream::ObjectOutputStream(O
+        objectHandle(0x7E0000),
+        classDescriptions(new ClassDescriptionMap())
+ {
+-   char start[] = { 0xAC, 0xED, 0x00, 0x05 };
+-   ByteBuffer buf(start, sizeof(start));
++   unsigned char start[] = { 0xAC, 0xED, 0x00, 0x05 };
++   ByteBuffer buf((char*) start, sizeof(start));
+    os->write(buf, p);
+ }
+ 
+@@ -81,7 +81,7 @@ void ObjectOutputStream::writeObject(con
+     //
+     //  TC_OBJECT and the classDesc for java.util.Hashtable
+     //
+-    char prolog[] = {
++    unsigned char prolog[] = {
+         0x72, 0x00, 0x13, 0x6A, 0x61, 0x76, 0x61, 
+         0x2E, 0x75, 0x74, 0x69, 0x6C, 0x2E, 0x48, 0x61, 
+         0x73, 0x68, 0x74, 0x61, 0x62, 0x6C, 0x65, 0x13, 
+@@ -90,7 +90,7 @@ void ObjectOutputStream::writeObject(con
+         0x64, 0x46, 0x61, 0x63, 0x74, 0x6F, 0x72, 0x49, 
+         0x00, 0x09, 0x74, 0x68, 0x72, 0x65, 0x73, 0x68, 
+         0x6F, 0x6C, 0x64, 0x78, 0x70  };
+-    writeProlog("java.util.Hashtable", 1, prolog, sizeof(prolog), p);
++    writeProlog("java.util.Hashtable", 1, (char*) prolog, sizeof(prolog), p);
+     //
+     //   loadFactor = 0.75, threshold = 5, blockdata start, buckets.size = 7
+     char data[] = { 0x3F, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 
+Index: src/main/cpp/loggingevent.cpp
+===================================================================
+--- src/main/cpp/loggingevent.cpp.orig
++++ src/main/cpp/loggingevent.cpp
+@@ -236,7 +236,7 @@ void LoggingEvent::setProperty(const Log
+ 
+ 
+ void LoggingEvent::writeProlog(ObjectOutputStream& os, Pool& p)  {
+-     char classDesc[] = {
++     unsigned char classDesc[] = {
+         0x72, 0x00, 0x21, 
+         0x6F, 0x72, 0x67, 0x2E, 0x61, 0x70, 0x61, 0x63, 
+         0x68, 0x65, 0x2E, 0x6C, 0x6F, 0x67, 0x34, 0x6A, 
+@@ -291,8 +291,8 @@ void LoggingEvent::writeProlog(ObjectOut
+         0x6F, 0x72, 0x6D, 0x61, 0x74, 0x69, 0x6F, 0x6E, 
+         0x3B, 0x78, 0x70 }; 
+ 
+-     os.writeProlog("org.apache.log4j.spi.LoggingEvent", 
+-        8, classDesc, sizeof(classDesc), p);
++     os.writeProlog("org.apache.log4j.spi.LoggingEvent",
++        8, (char*) classDesc, sizeof(classDesc), p);
+ }
+ 
+ void LoggingEvent::write(helpers::ObjectOutputStream& os, Pool& p) const {
+Index: src/main/cpp/locationinfo.cpp
+===================================================================
+--- src/main/cpp/locationinfo.cpp.orig
++++ src/main/cpp/locationinfo.cpp
+@@ -148,7 +148,7 @@ void LocationInfo::write(ObjectOutputStr
+     if (lineNumber == -1 && fileName == NA && methodName == NA_METHOD) {
+          os.writeNull(p);
+     } else {
+-        char prolog[] = {
++        unsigned char prolog[] = {
+          0x72, 0x00, 0x21, 0x6F, 0x72, 0x67, 0x2E, 
+          0x61, 0x70, 0x61, 0x63, 0x68, 0x65, 0x2E, 0x6C, 
+          0x6F, 0x67, 0x34, 0x6A, 0x2E, 0x73, 0x70, 0x69, 
+@@ -161,7 +161,7 @@ void LocationInfo::write(ObjectOutputStr
+                 0x61, 0x76, 0x61, 0x2F, 0x6C, 0x61, 0x6E, 0x67, 
+                 0x2F, 0x53, 0x74, 0x72, 0x69, 0x6E, 0x67, 0x3B,
+          0x78, 0x70 };
+-      os.writeProlog("org.apache.log4j.spi.LocationInfo", 2, prolog, sizeof(prolog), p);
++      os.writeProlog("org.apache.log4j.spi.LocationInfo", 2, (char*) prolog, sizeof(prolog), p);
+         char* line = p.itoa(lineNumber);
+         //
+         //   construct Java-like fullInfo (replace "::" with ".")
diff --git a/log4cxx.changes b/log4cxx.changes
index cade65a..94097c1 100644
--- a/log4cxx.changes
+++ b/log4cxx.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sun Oct 30 18:07:20 UTC 2016 - cbosdonnat@suse.com
+
+- Fix build with GCC6. gcc6.patch.
+  https://issues.apache.org/jira/browse/LOGCXX-463
+
 -------------------------------------------------------------------
 Fri Jan 20 14:09:43 UTC 2012 - jengelh@medozas.de
 
diff --git a/log4cxx.spec b/log4cxx.spec
index 4ab76a6..c2b0f81 100644
--- a/log4cxx.spec
+++ b/log4cxx.spec
@@ -26,6 +26,8 @@ Group:          Development/Libraries/C and C++
 Source:         apache-log4cxx-%{version}.tar.bz2
 # PATCH-MISSING-TAG -- See http://wiki.opensuse.org/openSUSE:Packaging_Patches_guidelines
 Patch0:         %{name}-fix_duplicate_entries.patch
+# PATH-UPSTREAM -- fix gcc6 build
+Patch1:         gcc6.patch
 BuildRequires:  doxygen
 BuildRequires:  gcc-c++
 BuildRequires:  graphviz
@@ -103,6 +105,7 @@ Log4cxx is a port to C++ of the log4j logging library.
 %prep
 %setup -qn apache-log4cxx-%{version}
 %patch0 -p1
+%patch1 -p0
 
 %build
 ./autogen.sh