--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -604,12 +604,12 @@
 set(CMAKE_C_EXTENSIONS ON)
 
 if (UNIX)
-  set( CMAKE_C_FLAGS "-Werror -Wall -Wmissing-prototypes -Wmissing-declarations ${CMAKE_C_FLAGS}")
-  set( CMAKE_CXX_FLAGS "-Werror -Wall -Wmissing-declarations ${CMAKE_CXX_FLAGS}")
+  set( CMAKE_C_FLAGS "-Wall -Wmissing-prototypes -Wmissing-declarations ${CMAKE_C_FLAGS}")
+  set( CMAKE_CXX_FLAGS "-Wall -Wmissing-declarations ${CMAKE_CXX_FLAGS}")
   set( CMAKE_C_FLAGS_RELEASE "-O3 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 ${CMAKE_C_FLAGS}")
 endif()
 if (MINGW)
-  set( CMAKE_C_FLAGS "-Werror -Wall -Wmissing-prototypes -Wmissing-declarations ${CMAKE_C_FLAGS}")
+  set( CMAKE_C_FLAGS "-Wall -Wmissing-prototypes -Wmissing-declarations ${CMAKE_C_FLAGS}")
   set( CMAKE_CXX_FLAGS "-DWINVER=0x0500 -D_EMULATE_GLIBC=0 ${CMAKE_CXX_FLAGS}") # Workaround for bug in gtest on mingw, see https://github.com/google/googletest/issues/893 and https://github.com/google/googletest/issues/920
 endif()
 
--- a/common/cmake_modules/GncAddSwigCommand.cmake
+++ b/common/cmake_modules/GncAddSwigCommand.cmake
@@ -73,7 +73,7 @@
         endif()
     set (DEFAULT_SWIG_PYTHON_FLAGS
         -python ${SWIG_EXTRA_OPT}
-        -Wall -Werror
+        -Wall
         ${SWIG_ARGS}
         )
     set (DEFAULT_SWIG_PYTHON_C_INCLUDES