where is the patch?
where is the fix for cosmic?
I tried "removing only the line, and put the stuff in ppa", and the result is a build failure.
It has been disabled for this reason
https://launchpad.net/~costamagnagianfranco/+archive/ubuntu/locutusofborg-ppa/+sourcepub/9428378/+listing-archive-extra


/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c: In function ‘X11_Vulkan_LoadLibrary’:
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:41:5: error: unknown type name ‘VkExtensionProperties’; did you mean ‘XExtensionHooks’?
     VkExtensionProperties *extensions = NULL;
     ^~~~~~~~~~~~~~~~~~~~~
     XExtensionHooks
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:67:13: error: ‘VK_NULL_HANDLE’ undeclared (first use in this function); did you mean ‘VK_DEFINE_HANDLE’?
             VK_NULL_HANDLE, "vkEnumerateInstanceExtensionProperties");
             ^~~~~~~~~~~~~~
             VK_DEFINE_HANDLE
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:67:13: note: each undeclared identifier is reported only once for each function it appears in
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:66:18: error: too many arguments to function ‘(void (*)(void))_this->vulkan_config.vkGetInstanceProcAddr’
         (void *)((PFN_vkGetInstanceProcAddr)_this->vulkan_config.vkGetInstanceProcAddr)(
                 ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:66:9: error: invalid use of void expression
         (void *)((PFN_vkGetInstanceProcAddr)_this->vulkan_config.vkGetInstanceProcAddr)(
         ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:70:18: warning: implicit declaration of function ‘SDL_Vulkan_CreateInstanceExtensionsList’; did you mean ‘SDL_Vulkan_GetInstanceExtensions’? [-Wimplicit-function-declaration]
     extensions = SDL_Vulkan_CreateInstanceExtensionsList(
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                  SDL_Vulkan_GetInstanceExtensions
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:70:16: warning: assignment to ‘int *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
     extensions = SDL_Vulkan_CreateInstanceExtensionsList(
                ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:78:23: error: ‘VK_KHR_SURFACE_EXTENSION_NAME’ undeclared (first use in this function); did you mean ‘GLX_EXTENSION_NAME’?
         if(SDL_strcmp(VK_KHR_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                       GLX_EXTENSION_NAME
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:78:67: error: request for member ‘extensionName’ in something not a structure or union
         if(SDL_strcmp(VK_KHR_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
                                                                   ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:80:28: error: ‘VK_KHR_XCB_SURFACE_EXTENSION_NAME’ undeclared (first use in this function)
         else if(SDL_strcmp(VK_KHR_XCB_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:80:76: error: request for member ‘extensionName’ in something not a structure or union
         else if(SDL_strcmp(VK_KHR_XCB_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
                                                                            ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:82:28: error: ‘VK_KHR_XLIB_SURFACE_EXTENSION_NAME’ undeclared (first use in this function)
         else if(SDL_strcmp(VK_KHR_XLIB_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:82:77: error: request for member ‘extensionName’ in something not a structure or union
         else if(SDL_strcmp(VK_KHR_XLIB_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
                                                                             ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:88:63: error: expected ‘)’ before ‘VK_KHR_SURFACE_EXTENSION_NAME’
         SDL_SetError("Installed Vulkan doesn't implement the "
                                                               ^
                                                               )
                      VK_KHR_SURFACE_EXTENSION_NAME " extension");
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~             
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:94:18: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
         videoData->vulkan_xlib_xcb_library = NULL;
                  ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:98:70: error: expected ‘)’ before ‘VK_KHR_XCB_SURFACE_EXTENSION_NAME’
         SDL_SetError("Installed Vulkan doesn't implement either the "
                                                                      ^
                                                                      )
                      VK_KHR_XCB_SURFACE_EXTENSION_NAME "extension or the "
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:108:18: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
         videoData->vulkan_xlib_xcb_library = SDL_LoadObject(libX11XCBLibraryName);
                  ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:109:22: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
         if(!videoData->vulkan_xlib_xcb_library)
                      ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:111:18: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_XGetXCBConnection’
         videoData->vulkan_XGetXCBConnection =
                  ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:112:39: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
             SDL_LoadFunction(videoData->vulkan_xlib_xcb_library, "XGetXCBConnection");
                                       ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:113:22: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_XGetXCBConnection’
         if(!videoData->vulkan_XGetXCBConnection)
                      ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:115:39: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
             SDL_UnloadObject(videoData->vulkan_xlib_xcb_library);
                                       ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c: In function ‘X11_Vulkan_UnloadLibrary’:
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:132:21: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
         if(videoData->vulkan_xlib_xcb_library)
                     ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:133:39: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
             SDL_UnloadObject(videoData->vulkan_xlib_xcb_library);
                                       ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c: In function ‘X11_Vulkan_GetInstanceExtensions’:
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:150:17: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
     if(videoData->vulkan_xlib_xcb_library)
                 ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:153:13: error: ‘VK_KHR_SURFACE_EXTENSION_NAME’ undeclared (first use in this function); did you mean ‘GLX_EXTENSION_NAME’?
             VK_KHR_SURFACE_EXTENSION_NAME, VK_KHR_XCB_SURFACE_EXTENSION_NAME,
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
             GLX_EXTENSION_NAME
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:153:44: error: ‘VK_KHR_XCB_SURFACE_EXTENSION_NAME’ undeclared (first use in this function)
             VK_KHR_SURFACE_EXTENSION_NAME, VK_KHR_XCB_SURFACE_EXTENSION_NAME,
                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:155:16: warning: implicit declaration of function ‘SDL_Vulkan_GetInstanceExtensions_Helper’; did you mean ‘SDL_Vulkan_GetInstanceExtensions_REAL’? [-Wimplicit-function-declaration]
         return SDL_Vulkan_GetInstanceExtensions_Helper(
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                SDL_Vulkan_GetInstanceExtensions_REAL
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:13: warning: initialization of ‘const char *’ from incompatible pointer type ‘const char * const*’ [-Wincompatible-pointer-types]
             VK_KHR_SURFACE_EXTENSION_NAME, VK_KHR_XLIB_SURFACE_EXTENSION_NAME,
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:13: note: (near initialization for ‘extensionsForXlib[0]’)
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:13: error: initializer element is not constant
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:13: note: (near initialization for ‘extensionsForXlib[0]’)
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:44: error: ‘VK_KHR_XLIB_SURFACE_EXTENSION_NAME’ undeclared (first use in this function)
             VK_KHR_SURFACE_EXTENSION_NAME, VK_KHR_XLIB_SURFACE_EXTENSION_NAME,
                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:44: warning: initialization of ‘const char *’ from incompatible pointer type ‘const char * const*’ [-Wincompatible-pointer-types]
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:44: note: (near initialization for ‘extensionsForXlib[1]’)
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:44: error: initializer element is not constant
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:161:44: note: (near initialization for ‘extensionsForXlib[1]’)
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c: In function ‘X11_Vulkan_CreateSurface’:
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:182:17: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_xlib_xcb_library’
     if(videoData->vulkan_xlib_xcb_library)
                 ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:184:9: error: unknown type name ‘PFN_vkCreateXcbSurfaceKHR’; did you mean ‘SDL_CreateRGBSurface’?
         PFN_vkCreateXcbSurfaceKHR vkCreateXcbSurfaceKHR =
         ^~~~~~~~~~~~~~~~~~~~~~~~~
         SDL_CreateRGBSurface
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:185:14: error: ‘PFN_vkCreateXcbSurfaceKHR’ undeclared (first use in this function); did you mean ‘vkCreateXcbSurfaceKHR’?
             (PFN_vkCreateXcbSurfaceKHR)vkGetInstanceProcAddr((VkInstance)instance,
              ^~~~~~~~~~~~~~~~~~~~~~~~~
              vkCreateXcbSurfaceKHR
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:185:13: warning: initialization of ‘int’ from ‘const char * const*’ makes integer from pointer without a cast [-Wint-conversion]
             (PFN_vkCreateXcbSurfaceKHR)vkGetInstanceProcAddr((VkInstance)instance,
             ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:185:40: error: expected ‘,’ or ‘;’ before ‘vkGetInstanceProcAddr’
             (PFN_vkCreateXcbSurfaceKHR)vkGetInstanceProcAddr((VkInstance)instance,
                                        ^~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:187:9: error: unknown type name ‘VkXcbSurfaceCreateInfoKHR’
         VkXcbSurfaceCreateInfoKHR createInfo;
         ^~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:188:9: error: unknown type name ‘VkResult’
         VkResult result;
         ^~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:191:26: error: ‘VK_KHR_XCB_SURFACE_EXTENSION_NAME’ undeclared (first use in this function)
             SDL_SetError(VK_KHR_XCB_SURFACE_EXTENSION_NAME
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:191:59: error: expected ‘)’ before string constant
             SDL_SetError(VK_KHR_XCB_SURFACE_EXTENSION_NAME
                                                           ^
                                                           )
                          " extension is not enabled in the Vulkan instance.");
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:191:26: warning: passing argument 1 of ‘SDL_SetError_REAL’ from incompatible pointer type [-Wincompatible-pointer-types]
             SDL_SetError(VK_KHR_XCB_SURFACE_EXTENSION_NAME
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from include/SDL_rect.h:32,
                 from include/SDL_video.h:33,
                 from include/SDL_messagebox.h:26,
                 from /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/../SDL_sysvideo.h:26,
                 from /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11video.h:28,
                 from /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:25:
include/SDL_error.h:41:79: note: expected ‘const char *’ but argument is of type ‘const char * const*’
 extern DECLSPEC int SDLCALL SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(1);
                                                                   ~~~~~~~~~~~~^~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:191:26: error: format not a string literal and no format arguments [-Werror=format-security]
             SDL_SetError(VK_KHR_XCB_SURFACE_EXTENSION_NAME
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:196:19: error: request for member ‘sType’ in something not a structure or union
         createInfo.sType = VK_STRUCTURE_TYPE_XCB_SURFACE_CREATE_INFO_KHR;
                   ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:196:28: error: ‘VK_STRUCTURE_TYPE_XCB_SURFACE_CREATE_INFO_KHR’ undeclared (first use in this function)
         createInfo.sType = VK_STRUCTURE_TYPE_XCB_SURFACE_CREATE_INFO_KHR;
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:196:9: warning: statement with no effect [-Wunused-value]
         createInfo.sType = VK_STRUCTURE_TYPE_XCB_SURFACE_CREATE_INFO_KHR;
         ^~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:197:19: error: request for member ‘connection’ in something not a structure or union
         createInfo.connection = videoData->vulkan_XGetXCBConnection(videoData->display);
                   ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:197:42: error: ‘SDL_VideoData’ {aka ‘struct SDL_VideoData’} has no member named ‘vulkan_XGetXCBConnection’
         createInfo.connection = videoData->vulkan_XGetXCBConnection(videoData->display);
                                          ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:197:33: error: called object is not a function or function pointer
         createInfo.connection = videoData->vulkan_XGetXCBConnection(videoData->display);
                                 ^~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:197:9: warning: statement with no effect [-Wunused-value]
         createInfo.connection = videoData->vulkan_XGetXCBConnection(videoData->display);
         ^~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:198:23: error: request for member ‘connection’ in something not a structure or union
         if(!createInfo.connection)
                       ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:203:19: error: request for member ‘window’ in something not a structure or union
         createInfo.window = (xcb_window_t)windowData->xwindow;
                   ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:203:30: error: ‘xcb_window_t’ undeclared (first use in this function); did you mean ‘window’?
         createInfo.window = (xcb_window_t)windowData->xwindow;
                              ^~~~~~~~~~~~
                              window
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:203:9: warning: statement with no effect [-Wunused-value]
         createInfo.window = (xcb_window_t)windowData->xwindow;
         ^~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:203:43: error: expected ‘;’ before ‘windowData’
         createInfo.window = (xcb_window_t)windowData->xwindow;
                                           ^~~~~~~~~~
                                           ;
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:204:18: error: called object ‘vkCreateXcbSurfaceKHR’ is not a function or function pointer
         result = vkCreateXcbSurfaceKHR(instance, &createInfo,
                  ^~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:184:35: note: declared here
         PFN_vkCreateXcbSurfaceKHR vkCreateXcbSurfaceKHR =
                                   ^~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:204:16: warning: assignment to ‘int’ from ‘const char * const*’ makes integer from pointer without a cast [-Wint-conversion]
         result = vkCreateXcbSurfaceKHR(instance, &createInfo,
                ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:206:22: error: ‘VK_SUCCESS’ undeclared (first use in this function); did you mean ‘EGL_SUCCESS’?
         if(result != VK_SUCCESS)
                      ^~~~~~~~~~
                      EGL_SUCCESS
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:206:19: warning: comparison between pointer and integer
         if(result != VK_SUCCESS)
                   ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:208:62: warning: implicit declaration of function ‘SDL_Vulkan_GetResultString’; did you mean ‘SDL_Vulkan_GetDrawableSize’? [-Wimplicit-function-declaration]
             SDL_SetError("vkCreateXcbSurfaceKHR failed: %s", SDL_Vulkan_GetResultString(result));
                                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~
                                                              SDL_Vulkan_GetDrawableSize
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:208:58: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
             SDL_SetError("vkCreateXcbSurfaceKHR failed: %s", SDL_Vulkan_GetResultString(result));
                                                         ~^   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                         %d
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:215:9: error: unknown type name ‘PFN_vkCreateXlibSurfaceKHR’; did you mean ‘SDL_CreateRGBSurface’?
         PFN_vkCreateXlibSurfaceKHR vkCreateXlibSurfaceKHR =
         ^~~~~~~~~~~~~~~~~~~~~~~~~~
         SDL_CreateRGBSurface
libtool: compile:  gcc -g -O2 -fdebug-prefix-map=/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DUSING_GENERATED_CONFIG_H -Iinclude -I/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/include -idirafter /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/khronos -mmmx -m3dnow -msse -msse2 -msse3 -Wall -fvisibility=hidden -Wdeclaration-after-statement -Werror=declaration-after-statement -D_REENTRANT -pthread -I/usr/include/mirclient -I/usr/include/mircookie -I/usr/include/mircore -I/usr/include/libdrm -Igen -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -pthread -I/usr/include/ibus-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -D_REENTRANT -DHAVE_LINUX_VERSION_H -c /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11video.c -o build/SDL_x11video.o >/dev/null 2>&1
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:216:14: error: ‘PFN_vkCreateXlibSurfaceKHR’ undeclared (first use in this function); did you mean ‘vkCreateXlibSurfaceKHR’?
             (PFN_vkCreateXlibSurfaceKHR)vkGetInstanceProcAddr((VkInstance)instance,
              ^~~~~~~~~~~~~~~~~~~~~~~~~~
              vkCreateXlibSurfaceKHR
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:216:13: warning: initialization of ‘int’ from ‘const char * const*’ makes integer from pointer without a cast [-Wint-conversion]
             (PFN_vkCreateXlibSurfaceKHR)vkGetInstanceProcAddr((VkInstance)instance,
             ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:216:41: error: expected ‘,’ or ‘;’ before ‘vkGetInstanceProcAddr’
             (PFN_vkCreateXlibSurfaceKHR)vkGetInstanceProcAddr((VkInstance)instance,
                                         ^~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:218:9: error: unknown type name ‘VkXlibSurfaceCreateInfoKHR’
         VkXlibSurfaceCreateInfoKHR createInfo;
         ^~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:219:9: error: unknown type name ‘VkResult’
         VkResult result;
         ^~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:222:26: error: ‘VK_KHR_XLIB_SURFACE_EXTENSION_NAME’ undeclared (first use in this function)
             SDL_SetError(VK_KHR_XLIB_SURFACE_EXTENSION_NAME
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:222:60: error: expected ‘)’ before string constant
             SDL_SetError(VK_KHR_XLIB_SURFACE_EXTENSION_NAME
                                                            ^
                                                            )
                          " extension is not enabled in the Vulkan instance.");
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:222:26: warning: passing argument 1 of ‘SDL_SetError_REAL’ from incompatible pointer type [-Wincompatible-pointer-types]
             SDL_SetError(VK_KHR_XLIB_SURFACE_EXTENSION_NAME
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from include/SDL_rect.h:32,
                 from include/SDL_video.h:33,
                 from include/SDL_messagebox.h:26,
                 from /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/../SDL_sysvideo.h:26,
                 from /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11video.h:28,
                 from /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:25:
include/SDL_error.h:41:79: note: expected ‘const char *’ but argument is of type ‘const char * const*’
 extern DECLSPEC int SDLCALL SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(1);
                                                                   ~~~~~~~~~~~~^~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:222:26: error: format not a string literal and no format arguments [-Werror=format-security]
             SDL_SetError(VK_KHR_XLIB_SURFACE_EXTENSION_NAME
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:227:19: error: request for member ‘sType’ in something not a structure or union
         createInfo.sType = VK_STRUCTURE_TYPE_XLIB_SURFACE_CREATE_INFO_KHR;
                   ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:227:28: error: ‘VK_STRUCTURE_TYPE_XLIB_SURFACE_CREATE_INFO_KHR’ undeclared (first use in this function)
         createInfo.sType = VK_STRUCTURE_TYPE_XLIB_SURFACE_CREATE_INFO_KHR;
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:227:9: warning: statement with no effect [-Wunused-value]
         createInfo.sType = VK_STRUCTURE_TYPE_XLIB_SURFACE_CREATE_INFO_KHR;
         ^~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:228:19: error: request for member ‘dpy’ in something not a structure or union
         createInfo.dpy = videoData->display;
                   ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:228:9: warning: statement with no effect [-Wunused-value]
         createInfo.dpy = videoData->display;
         ^~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:229:19: error: request for member ‘window’ in something not a structure or union
         createInfo.window = (xcb_window_t)windowData->xwindow;
                   ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:229:9: warning: statement with no effect [-Wunused-value]
         createInfo.window = (xcb_window_t)windowData->xwindow;
         ^~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:229:43: error: expected ‘;’ before ‘windowData’
         createInfo.window = (xcb_window_t)windowData->xwindow;
                                           ^~~~~~~~~~
                                           ;
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:230:18: error: called object ‘vkCreateXlibSurfaceKHR’ is not a function or function pointer
         result = vkCreateXlibSurfaceKHR(instance, &createInfo,
                  ^~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:215:36: note: declared here
         PFN_vkCreateXlibSurfaceKHR vkCreateXlibSurfaceKHR =
                                    ^~~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:230:16: warning: assignment to ‘int’ from ‘const char * const*’ makes integer from pointer without a cast [-Wint-conversion]
         result = vkCreateXlibSurfaceKHR(instance, &createInfo,
                ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:232:19: warning: comparison between pointer and integer
         if(result != VK_SUCCESS)
                   ^~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:234:59: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
             SDL_SetError("vkCreateXlibSurfaceKHR failed: %s", SDL_Vulkan_GetResultString(result));
                                                          ~^   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                          %d
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:175:31: warning: variable ‘vkGetInstanceProcAddr’ set but not used [-Wunused-but-set-variable]
     PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr;
                               ^~~~~~~~~~~~~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:174:21: warning: unused variable ‘windowData’ [-Wunused-variable]
     SDL_WindowData *windowData = (SDL_WindowData *)window->driverdata;
                     ^~~~~~~~~~
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c: In function ‘X11_Vulkan_GetInstanceExtensions’:
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:166:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c: In function ‘X11_Vulkan_CreateSurface’:
/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11vulkan.c:239:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
cc1: some warnings being treated as errors
make[2]: *** [Makefile:614: build/SDL_x11vulkan.lo] Error 1
make[2]: *** Waiting for unfinished jobs....
libtool: compile:  gcc -g -O2 -fdebug-prefix-map=/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DUSING_GENERATED_CONFIG_H -Iinclude -I/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/include -idirafter /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/khronos -mmmx -m3dnow -msse -msse2 -msse3 -Wall -fvisibility=hidden -Wdeclaration-after-statement -Werror=declaration-after-statement -D_REENTRANT -pthread -I/usr/include/mirclient -I/usr/include/mircookie -I/usr/include/mircore -I/usr/include/libdrm -Igen -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -pthread -I/usr/include/ibus-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -D_REENTRANT -DHAVE_LINUX_VERSION_H -c /<<BUILDDIR>>/libsdl2-2.0.8+dfsg1/src/video/x11/SDL_x11window.c -o build/SDL_x11window.o >/dev/null 2>&1
make[2]: Leaving directory '/<<BUILDDIR>>/libsdl2-2.0.8+dfsg1'
dh_auto_build: make -j4 V=1 returned exit code 2