$OpenBSD$

Index: cmake/globals.cmake
--- cmake/globals.cmake.orig
+++ cmake/globals.cmake
@@ -29,6 +29,9 @@ if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
 elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
   set(PLATFORM_POSIX 1)
   set(PLATFORM_MACOS 1)
+elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "OpenBSD")
+  set(PLATFORM_POSIX 1)
+  set(PLATFORM_OPENBSD 1)
 elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
   set(PLATFORM_WINDOWS 1)
 else()
