diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6881cb65..adc36d13 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -42,7 +42,7 @@ Fedora_MinGW:
     - dnf -y upgrade
     - dnf -y install mingw64-gcc-c++ mingw64-filesystem mingw64-expat mingw64-zlib cmake make
   script:
-    - python3 ci/test_build.py --without-tests --cmake-executable "mingw64-cmake" --cmake-options "-DEXIV2_TEAM_EXTRA_WARNINGS=ON -DEXIV2_ENABLE_VIDEO=ON -DEXIV2_ENABLE_WEBREADY=ON -DEXIV2_ENABLE_WIN_UNICODE=ON " --compilers --shared-libs OFF
+    - python3 ci/test_build.py --without-tests --cmake-executable "mingw64-cmake" --cmake-options "-DEXIV2_TEAM_EXTRA_WARNINGS=OFF -DEXIV2_TEAM_WARNINGS_AS_ERRORS=OFF -DEXIV2_ENABLE_WEBREADY=ON -DEXIV2_ENABLE_WIN_UNICODE=ON " --compilers --shared-libs OFF
 
 Debian:
   image: debian:9
diff --git a/.travis.yml b/.travis.yml
index 974dec10..0fc522b7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -76,14 +76,14 @@ matrix:
         - BUILD_TYPE="Release"
         - WITH_VALGRIND=1
 
-          #- name: "Ubuntu 20.04 - gcc-9.3 (Release+Sanitizers)"
-          #  os: linux
-          #  dist: focal
-          #  sudo: required
-          #  compiler: gcc
-          #  env:
-          #    - BUILD_TYPE="Release"
-          #    - WITH_SANITIZERS=1
+    - name: "Ubuntu 20.04 - gcc-9.3 (Release+Sanitizers)"
+      os: linux
+      dist: focal
+      sudo: required
+      compiler: gcc
+      env:
+        - BUILD_TYPE="Release"
+        - WITH_SANITIZERS=1
 
     - name: "macOS 10.14 - XCode 11.3 (Release)"
       os: osx
diff --git a/appveyor_mingw_cygwin.yml b/appveyor_mingw_cygwin.yml
index 31f054d4..5fce258b 100644
--- a/appveyor_mingw_cygwin.yml
+++ b/appveyor_mingw_cygwin.yml
@@ -11,14 +11,14 @@ environment:
       ARCHITECTURE: x86_64
       UNIT_TESTS: 1
       WEBREADY: False
-      WARNINGS_AS_ERRORS: ON
+      WARNINGS_AS_ERRORS: OFF
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       BUILD: CYGWIN64
       INTEGRATION_TESTS: 1
       ARCHITECTURE: x86_64
       UNIT_TESTS: 1
       WEBREADY: False
-      WARNINGS_AS_ERRORS: ON
+      WARNINGS_AS_ERRORS: OFF
 
 shallow_clone: true
 
@@ -39,7 +39,7 @@ install:
 build_script:
     - cmd: set   CMD=mkdir -p build
     - cmd: set   CMD=%CMD%; cd build    
-    - cmd: set   CMD=%CMD%; cmake .. -G 'Unix Makefiles' -DCMAKE_CXX_STANDARD=98 -DCMAKE_CXX_FLAGS=-Wno-deprecated
+    - cmd: set   CMD=%CMD%; cmake .. -G 'Unix Makefiles' 
     - cmd: set   CMD=%CMD%; cmake --build . --config Release
     - cmd: rem echo %CMD%
     - cd %APPVEYOR_BUILD_FOLDER%
@@ -47,7 +47,7 @@ build_script:
     - cmd: set   CMD=which python3 python
     - cmd: set   CMD=%CMD%; python --version
     - cmd: set   CMD=%CMD%; build/bin/exiv2 --verbose --version; pwd ; ls -l
-    - cmd: set   CMD=%CMD%; cd build ; cmake --build . --config Release --target python_tests
+    - cmd: set   CMD=%CMD%; cd build ; cmake --build . --config Release --target python_tests 
     - cmd: echo %CMD%
     - cd %APPVEYOR_BUILD_FOLDER%
     - cmd: if "%BUILD%"=="MINGW64" C:\msys64\usr\bin\bash -c "%CMD%"
@@ -55,7 +55,7 @@ build_script:
     - cmd: set  CMD=rm -rf build
     - cmd: set  CMD=%CMD%; mkdir -p build
     - cmd: set  CMD=%CMD%; cd build
-    - cmd: set  CMD=%CMD%;cmake .. -DCMAKE_CXX_STANDARD=98 -DCMAKE_CXX_FLAGS=-Wno-deprecated
+    - cmd: set  CMD=%CMD%;cmake ..
     - cmd: set  CMD=%CMD%; make
     - cmd: set  CMD=%CMD%; make python_tests
     - cmd: echo %CMD%
diff --git a/src/jp2image.cpp b/src/jp2image.cpp
index fafc6b1d..b6e5e161 100644
--- a/src/jp2image.cpp
+++ b/src/jp2image.cpp
@@ -658,7 +658,7 @@ static void boxes_check(size_t b,size_t m)
             Jp2BoxHeader* pSubBox = (Jp2BoxHeader*) (p+count) ;
 
             // copy data.  pointer could be into a memory mapped file which we will decode!
-            Jp2BoxHeader   subBox = *pSubBox ;
+            Jp2BoxHeader   subBox ; memcpy(&subBox,pSubBox,sizeof(subBox));
             Jp2BoxHeader   newBox =  subBox;
 
             if ( count < length ) {
diff --git a/src/tiffvisitor_int.cpp b/src/tiffvisitor_int.cpp
index 67072235..7156fdf0 100644
--- a/src/tiffvisitor_int.cpp
+++ b/src/tiffvisitor_int.cpp
@@ -979,10 +979,12 @@ namespace Exiv2 {
                 std::cerr << "Writing data area for " << key << "\n";
 #endif
                 DataBuf buf = object->pValue()->dataArea();
-                memcpy(object->pDataArea_, buf.pData_, buf.size_);
-                if (object->sizeDataArea_ > static_cast<uint32_t>(buf.size_)) {
-                    memset(object->pDataArea_ + buf.size_,
+                if ( buf.pData_ ) {
+                    memcpy(object->pDataArea_, buf.pData_, buf.size_);
+                    if (object->sizeDataArea_ > static_cast<uint32_t>(buf.size_)) {
+                        memset(object->pDataArea_ + buf.size_,
                            0x0, object->sizeDataArea_ - buf.size_);
+                    }
                 }
             }
         }