diff --git a/.appveyor-vcpkg.yml b/.appveyor-vcpkg.yml
index b579ac20..62ef578d 100644
--- a/.appveyor-vcpkg.yml
+++ b/.appveyor-vcpkg.yml
@@ -38,7 +38,7 @@ install:
 build_script:
   - mkdir build
   - cd build
-  - cmake -G "%generator%" -T "%toolset%" -Denable-pkgconfig=0 -DCMAKE_TOOLCHAIN_FILE=c:/Tools/vcpkg/scripts/buildsystems/vcpkg.cmake -DNO_GUI=1 ..
+  - cmake -Werror=dev -G "%generator%" -T "%toolset%" -Denable-pkgconfig=0 -DCMAKE_TOOLCHAIN_FILE=c:/Tools/vcpkg/scripts/buildsystems/vcpkg.cmake -DNO_GUI=1 ..
   - cmake --build . --config Release # build libfluidsynth and fluidsynth exec
   - cmake --build . --config Release --target check # build and exec unittests
 
diff --git a/.azure-pipelines-mac.yml b/.azure-pipelines-mac.yml
index bc57c4e7..2a7f7704 100644
--- a/.azure-pipelines-mac.yml
+++ b/.azure-pipelines-mac.yml
@@ -15,7 +15,7 @@ jobs:
     - script: |
         mkdir build && cd build
         export PKG_CONFIG_PATH="/usr/local/opt/libffi/lib/pkgconfig"
-        cmake -DCMAKE_INSTALL_PREFIX=$(Build.ArtifactStagingDirectory) -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 ..
+        cmake -Werror=dev -DCMAKE_INSTALL_PREFIX=$(Build.ArtifactStagingDirectory) -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 ..
         make
       displayName: 'Compile fluidsynth'
     - script: |
diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index dbf60f84..3c91e92d 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -55,7 +55,7 @@ jobs:
         SET "PATH=d:\deps\bin;%PATH%"
         pkg-config --list-all
         mkdir build && cd build || exit -1
-        cmake -A $(platform) -T $(toolset) -DCMAKE_INSTALL_PREFIX=$(Build.ArtifactStagingDirectory) -Denable-readline=0 -Denable-floats=1 -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 .. || exit -1
+        cmake -Werror=dev -A $(platform) -T $(toolset) -DCMAKE_INSTALL_PREFIX=$(Build.ArtifactStagingDirectory) -Denable-readline=0 -Denable-floats=1 -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 .. || exit -1
         cmake --build . --config Release || exit -1
       displayName: 'Compile fluidsynth'
     - script: |
@@ -127,7 +127,7 @@ jobs:
         @ECHO ON
         SET "PATH=d:\deps\bin;%PATH%"
         mkdir build && cd build || exit -1
-        cmake -A x64 -DCMAKE_BUILD_TYPE=$(CMAKE_CONFIG) -DCMAKE_VERBOSE_MAKEFILE=1 $(CMAKE_FLAGS) -DNO_GUI=1 .. || exit -1
+        cmake -Werror=dev -A x64 -DCMAKE_BUILD_TYPE=$(CMAKE_CONFIG) -DCMAKE_VERBOSE_MAKEFILE=1 $(CMAKE_FLAGS) -DNO_GUI=1 .. || exit -1
         cmake --build . --config $(CMAKE_CONFIG) || exit -1
       displayName: 'Compile fluidsynth'
     - script: |
@@ -189,7 +189,7 @@ jobs:
         set PATH=%PATH:C:\Program Files\Git\usr\bin;=%
         pkg-config --list-all
         mkdir build && cd build || exit -1
-        cmake -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=$(Build.ArtifactStagingDirectory) $(CMAKE_FLAGS) -Denable-readline=0 -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 .. || exit -1
+        cmake -Werror=dev -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=$(Build.ArtifactStagingDirectory) $(CMAKE_FLAGS) -Denable-readline=0 -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 .. || exit -1
         mingw32-make.exe all || exit -1
       displayName: 'Compile fluidsynth'
     - script: |
diff --git a/.cirrus.yml b/.cirrus.yml
index 59bf385e..9bd4146e 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -9,5 +9,5 @@ task:
 
     install_script: pwd && ls -la && pkg install -y cmake glib alsa-lib ladspa portaudio pulseaudio pkgconf sdl2
     
-    compile_script: pwd && ls -la && mkdir $HOME/fluidsynth_install/ && mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX=$HOME/fluidsynth_install -Denable-portaudio=1 -Denable-ladspa=1 -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_VERBOSE_MAKEFILE=0  -DNO_GUI=1 .. && make -j4 && make check && make install 
+    compile_script: pwd && ls -la && mkdir $HOME/fluidsynth_install/ && mkdir build && cd build && cmake -Werror=dev -DCMAKE_INSTALL_PREFIX=$HOME/fluidsynth_install -Denable-portaudio=1 -Denable-ladspa=1 -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_VERBOSE_MAKEFILE=0  -DNO_GUI=1 .. && make -j4 && make check && make install
 
diff --git a/.travis.yml b/.travis.yml
index e897e9d9..4c65bdf9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -69,7 +69,7 @@ before_script:
     - mkdir build && cd build
 
 script:
-    - cmake -DCMAKE_INSTALL_PREFIX=$HOME/fluidsynth_install ${CMAKE_FLAGS} -Denable-portaudio=1 -Denable-ladspa=1 -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 ..
+    - cmake -Werror=dev -DCMAKE_INSTALL_PREFIX=$HOME/fluidsynth_install ${CMAKE_FLAGS} -Denable-portaudio=1 -Denable-ladspa=1 -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_VERBOSE_MAKEFILE=1 -DNO_GUI=1 ..
     - make -j4
     - make check
     - make install # install only on linux, as CMAKE_INSTALL_PREFIX is ignored for frameworks on macosx and I cant tell whether that's correct or a bug.