diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 00000000..abe2c7db
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,233 @@
+language: cpp
+
+matrix:
+  include:
+
+    - os: osx
+      compiler: gcc
+      name: macOS - gcc@5 - opencv@2
+      env:
+        - MATRIX_EVAL="brew update && brew install gcc@5 gcc opencv@2 && CC=gcc-5 && CXX=g++-5 && OpenCV_DIR=/usr/local/opt/opencv@2"
+
+    - os: osx
+      compiler: gcc
+      name: macOS - gcc@5 - opencv@3
+      env:
+        - MATRIX_EVAL="brew update && brew install gcc@5 gcc opencv@3 && CC=gcc-5 && CXX=g++-5 && OpenCV_DIR=/usr/local/opt/opencv@3"
+
+    - os: osx
+      compiler: gcc
+      name: macOS - native gcc (llvm backend) - opencv@2
+      env:
+        - MATRIX_EVAL="brew update && brew install opencv@2 && OpenCV_DIR=/usr/local/opt/opencv@2"
+
+    - os: osx
+      compiler: gcc
+      name: macOS - native gcc (llvm backend) - opencv@3
+      env:
+        - MATRIX_EVAL="brew update && brew install opencv@3 && OpenCV_DIR=/usr/local/opt/opencv@3"
+
+    - os: osx
+      compiler: clang
+      name: macOS - native clang - opencv@2
+      env:
+        - MATRIX_EVAL="brew update && brew install opencv@2 && OpenCV_DIR=/usr/local/opt/opencv@2"
+
+    - os: osx
+      compiler: clang
+      name: macOS - native clang - opencv@3
+      env:
+        - MATRIX_EVAL="brew update && brew install opencv@3 && OpenCV_DIR=/usr/local/opt/opencv@3"
+
+    - os: linux
+      compiler: clang
+      name: ubuntu - native clang
+      addons:
+        apt:
+          update: true
+          packages:
+            - libopencv-dev
+      env:
+        - MATRIX_EVAL=""
+
+    - os: linux
+      compiler: clang
+      name: ubuntu - clang@3.6
+      addons:
+        apt:
+          update: true
+          packages:
+            - libopencv-dev
+            - clang-3.6
+      env:
+        - MATRIX_EVAL="CC=clang-3.6 && CXX=clang++-3.6"
+
+    - os: linux
+      compiler: clang
+      name: ubuntu - clang@3.8
+      addons:
+        apt:
+          update: true
+          sources:
+            - llvm-toolchain-precise-3.8
+          packages:
+            - libopencv-dev
+            - clang-3.8
+      env:
+        - MATRIX_EVAL="CC=clang-3.8 && CXX=clang++-3.8"
+
+    - os: linux
+      compiler: clang
+      name: ubuntu - clang@3.9
+      addons:
+        apt:
+          update: true
+          sources:
+            - llvm-toolchain-trusty-3.9
+          packages:
+            - libopencv-dev
+            - clang-3.9
+      env:
+        - MATRIX_EVAL="CC=clang-3.9 && CXX=clang++-3.9"
+
+    - os: linux
+      compiler: clang
+      name: ubuntu - clang@4.0
+      addons:
+        apt:
+          update: true
+          sources:
+            - llvm-toolchain-trusty-4.0
+          packages:
+            - libopencv-dev
+            - clang-4.0
+      env:
+        - MATRIX_EVAL="CC=clang-4.0 && CXX=clang++-4.0"
+
+    - os: linux
+      compiler: clang
+      name: ubuntu - clang@5.0
+      addons:
+        apt:
+          update: true
+          sources:
+            - llvm-toolchain-trusty-5.0
+          packages:
+            - libopencv-dev
+            - clang-5.0
+      env:
+        - MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0"
+
+    - os: linux
+      compiler: clang
+      name: ubuntu - clang@6.0
+      addons:
+        apt:
+          update: true
+          sources:
+            - llvm-toolchain-trusty-6.0
+            - ubuntu-toolchain-r-test
+          packages:
+            - libopencv-dev
+            - clang-6.0
+      env:
+        - MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0"
+
+    - os: linux
+      compiler: gcc
+      name: ubuntu - native gcc
+      addons:
+        apt:
+          update: true
+          packages:
+            - libopencv-dev
+            - gfortran
+      env:
+        - MATRIX_EVAL=""
+
+    - os: linux
+      compiler: gcc
+      name: ubuntu - gcc@4.9
+      addons:
+        apt:
+          update: true
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - libopencv-dev
+            - g++-4.9
+      env:
+         - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
+
+    - os: linux
+      compiler: gcc
+      name: ubuntu - gcc@5.0
+      addons:
+        apt:
+          update: true
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - libopencv-dev
+            - g++-5
+      env:
+         - MATRIX_EVAL="CC=gcc-5 && CXX=g++-5"
+
+    - os: linux
+      compiler: gcc
+      name: ubuntu - gcc@6.0
+      addons:
+        apt:
+          update: true
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-6
+            - libopencv-dev
+      env:
+        - MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"
+
+    - os: linux
+      compiler: gcc
+      name: ubuntu - gcc@7.0
+      addons:
+        apt:
+          update: true
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - libopencv-dev
+            - g++-7
+      env:
+        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7"
+
+    - os: linux
+      compiler: gcc
+      name: ubuntu - gcc@8.0
+      addons:
+        apt:
+          update: true
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - libopencv-dev
+            - g++-8
+      env:
+        - MATRIX_EVAL="CC=gcc-8 && CXX=g++-8"
+
+before_install:
+  - eval "${MATRIX_EVAL}"
+
+before_script:
+  - mkdir build_debug
+  - cd build_debug
+  - cmake .. -DCMAKE_BUILD_TYPE="Debug"
+  - cd ..
+  - mkdir build_release
+  - cd build_release
+  - cmake .. -DCMAKE_BUILD_TYPE="Release"
+  - cd ..
+
+script:
+  - cd build_debug && cmake --build . --target install && cd ..
+  - cd build_release && cmake --build . --target install && cd ..
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 401c74bd..932a166e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 # To use your libs, launch cmake with -DUSE_INTEGRATED_LIBS:BOOL=FALSE
 
-cmake_minimum_required(VERSION 3.8 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.4)
 
 #set(CMAKE_VERBOSE_MAKEFILE 1)
 
@@ -21,12 +21,17 @@ enable_language(CXX)
 
 set(ENABLE_CUDA "TRUE" CACHE BOOL "Enable CUDA build")
 
-include(CheckLanguage)
-check_language(CUDA)
-if(CMAKE_CUDA_COMPILER)
-  enable_language(CUDA)
+if(${CMAKE_VERSION} VERSION_LESS "3.8.0")
+  set(ENABLE_CUDA "FALSE" CACHE BOOL "Enable CUDA build" FORCE)
+  message(WARNING "To build with CUDA support you need CMake 3.8.0+")
 else()
-  set(ENABLE_CUDA "FALSE" CACHE BOOL "Enable CUDA build")
+  include(CheckLanguage)
+  check_language(CUDA)
+  if(CMAKE_CUDA_COMPILER)
+    enable_language(CUDA)
+  else()
+    set(ENABLE_CUDA "FALSE" CACHE BOOL "Enable CUDA build" FORCE)
+  endif()
 endif()
 
 set(CMAKE_CXX_STANDARD 11)
@@ -112,9 +117,6 @@ endif()
 
 if(ENABLE_CUDA)
   add_definitions(-DGPU)
-  if(NOT WIN32)
-    include_directories("${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}")
-  endif()
   if(CUDA_COMPUTE_MODEL VERSION_GREATER_EQUAL ${CUDA_COMPUTE_MODEL_75} AND CMAKE_CUDA_COMPILER_VERSION VERSION_LESS_EQUAL 9)
     message(STATUS "CUDA 10 is required for Compute Model 7.5 - Lowering settings to 7.0")
     set(CUDA_COMPUTE_MODEL ${CUDA_COMPUTE_MODEL_70})
@@ -226,7 +228,7 @@ endif()
 target_compile_definitions(darklib PRIVATE LIB_EXPORTS=1)
 set_target_properties(darklib PROPERTIES LINKER_LANGUAGE CXX)
 
-if(OpenCV_VERSION_MAJOR GREATER_EQUAL 3)
+if(OpenCV_VERSION VERSION_GREATER "3.0")
   add_executable(uselib_track ${CMAKE_CURRENT_LIST_DIR}/src/yolo_console_dll.cpp)
   target_compile_definitions(uselib_track PRIVATE TRACK_OPTFLOW=1)
   set_target_properties(uselib_track PROPERTIES LINKER_LANGUAGE CXX)
@@ -275,7 +277,7 @@ if(ENABLE_CUDA)
 endif()
 
 target_link_libraries(uselib darklib)
-if(OpenCV_VERSION_MAJOR GREATER_EQUAL 3)
+if(OpenCV_VERSION VERSION_GREATER "3.0")
   target_link_libraries(uselib_track darklib)
   install(TARGETS uselib_track DESTINATION ${CMAKE_SOURCE_DIR}/)
 endif()
diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 00000000..9f6d32ce
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,48 @@
+image: Visual Studio 2017
+clone_folder: c:\projects\darknet
+configuration: Release
+
+environment:
+    WORKSPACE: C:\projects
+    matrix:
+    - platform: Cygwin64
+      COMPILER: cygwin
+      CYGWIN_NOWINPATH: yes
+      CYGSH: C:\cygwin64\bin\bash -c
+    - platform: Win64
+      COMPILER: vs
+      VCPKG_ROOT: C:\projects\vcpkg
+      VCPKG_DEFAULT_TRIPLET: x64-windows
+
+
+install:
+  - if [%COMPILER%]==[vs] cinst cmake ninja
+  - if [%COMPILER%]==[vs] SET "PATH=C:\Program Files\CMake\bin;%PATH%"
+  - if [%COMPILER%]==[vs] call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x64
+  - if [%COMPILER%]==[cygwin] SET "PATH=C:\cygwin64\bin;C:\cygwin64\usr\bin;%PATH%"
+  - if [%COMPILER%]==[cygwin] SET PATH=%PATH:C:\Program Files\Git\usr\bin;=%
+  - git submodule -q update --init --recursive
+  - cd %WORKSPACE%\
+  - mkdir cygwin-downloads
+  - ps: if($env:COMPILER -eq "cygwin") { Invoke-WebRequest https://cygwin.com/setup-x86_64.exe -OutFile $env:WORKSPACE\cygwin-setup.exe }
+  - if [%COMPILER%]==[cygwin] %WORKSPACE%\cygwin-setup.exe --quiet-mode --no-shortcuts --no-startmenu --no-desktop --upgrade-also --root C:\cygwin64 --local-package-dir %WORKSPACE%\cygwin-downloads --packages gcc-g++,cmake,libopencv-devel
+  - if [%COMPILER%]==[vs] git clone https://github.com/Microsoft/vcpkg
+  - if [%COMPILER%]==[vs] cd %VCPKG_ROOT%
+  - if [%COMPILER%]==[vs] bootstrap-vcpkg.bat
+  - if [%COMPILER%]==[vs] vcpkg integrate install
+  - if [%COMPILER%]==[vs] vcpkg install opencv pthreads
+  - cd %WORKSPACE%\darknet\
+  - mkdir build_debug && cd build_debug
+  - if [%COMPILER%]==[cygwin] %CYGSH% 'cmake .. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Debug"'
+  - if [%COMPILER%]==[vs] cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" "-DCMAKE_TOOLCHAIN_FILE=%VCPKG_ROOT%\scripts\buildsystems\vcpkg.cmake" "-DVCPKG_TARGET_TRIPLET=%VCPKG_DEFAULT_TRIPLET%" -DCMAKE_BUILD_TYPE="Debug" ..
+  - cd ..
+  - mkdir build_release && cd build_release
+  - if [%COMPILER%]==[cygwin] %CYGSH% 'cmake .. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Release"'
+  - if [%COMPILER%]==[vs] cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" "-DCMAKE_TOOLCHAIN_FILE=%VCPKG_ROOT%\scripts\buildsystems\vcpkg.cmake" "-DVCPKG_TARGET_TRIPLET=%VCPKG_DEFAULT_TRIPLET%" -DCMAKE_BUILD_TYPE="Release" ..
+  - cd ..
+
+build_script:
+  - if [%COMPILER%]==[cygwin] cd build_debug   && %CYGSH% 'cmake --build .'        && cd ..
+  - if [%COMPILER%]==[cygwin] cd build_release && %CYGSH% 'cmake --build .'        && cd ..
+  - if [%COMPILER%]==[vs]     cd build_debug   && cmake --build . --config Debug   && cd ..
+  - if [%COMPILER%]==[vs]     cd build_release && cmake --build . --config Release && cd ..
diff --git a/src/yolo_console_dll.cpp b/src/yolo_console_dll.cpp
index c4554fba..be84f4d5 100644
--- a/src/yolo_console_dll.cpp
+++ b/src/yolo_console_dll.cpp
@@ -36,7 +36,7 @@
 #endif    // TRACK_OPTFLOW
 #endif    // USE_CMAKE_LIBS
 #else
-#define OPENCV_VERSION CVAUX_STR(CV_VERSION_EPOCH)""CVAUX_STR(CV_VERSION_MAJOR)""CVAUX_STR(CV_VERSION_MINOR)
+#define OPENCV_VERSION CVAUX_STR(CV_VERSION_EPOCH)"" CVAUX_STR(CV_VERSION_MAJOR)"" CVAUX_STR(CV_VERSION_MINOR)
 #ifndef USE_CMAKE_LIBS
 #pragma comment(lib, "opencv_core" OPENCV_VERSION ".lib")
 #pragma comment(lib, "opencv_imgproc" OPENCV_VERSION ".lib")