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dnl VKD3D_CHECK_VULKAN_HEADER_VERSION
AC_DEFUN([VKD3D_CHECK_VULKAN_HEADER_VERSION],
[AS_VAR_PUSHDEF([vkd3d_vk_version], vkd3d_cv_vk_header_version_[[$1]])
AC_CACHE_CHECK([whether VK_HEADER_VERSION >= [$1]], vkd3d_vk_version,
[AC_LINK_IFELSE(
[AC_LANG_SOURCE([#include <vulkan/vulkan.h>
#if VK_HEADER_VERSION < $1
#error "Vulkan headers are too old"
#endif
int main(void) { return 0; }])],
[AS_VAR_SET([vkd3d_vk_version], [yes])],
[AS_VAR_SET([vkd3d_vk_version], [no])])])
AS_IF([test "x$vkd3d_vk_version" != "xyes"], [$2])
AS_VAR_POPDEF([vkd3d_vk_version])])
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