$NetBSD$

Support *BSD.

--- CMakeLists.txt.orig	2024-08-16 21:53:25.000000000 +0000
+++ CMakeLists.txt
@@ -144,6 +144,18 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwi
   message("Building for MAC OSX")
   add_compile_definitions(POSIX MACOSX=1 _USE_OGL_ACTIVE_TEXTURES PRIMARY_HOG=\"d3-osx.hog\")
   set(PLATFORM_INCLUDES "lib/linux" ${SDL2_INCLUDE_DIR} ${SDL2_INCLUDE_DIRS})
+elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+  message("Building for FreeBSD")
+  add_compile_definitions(POSIX _USE_OGL_ACTIVE_TEXTURES PRIMARY_HOG=\"d3-freebsd.hog\")
+  set(PLATFORM_INCLUDES "lib/linux" ${SDL2_INCLUDE_DIR} ${SDL2_INCLUDE_DIRS})
+elseif(CMAKE_SYSTEM_NAME STREQUAL "NetBSD")
+  message("Building for NetBSD")
+  add_compile_definitions(POSIX _USE_OGL_ACTIVE_TEXTURES PRIMARY_HOG=\"d3-netbsd.hog\")
+  set(PLATFORM_INCLUDES "lib/linux" ${SDL2_INCLUDE_DIR} ${SDL2_INCLUDE_DIRS})
+elseif(CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
+  message("Building for OpenBSD")
+  add_compile_definitions(POSIX _USE_OGL_ACTIVE_TEXTURES PRIMARY_HOG=\"d3-openbsd.hog\")
+  set(PLATFORM_INCLUDES "lib/linux" ${SDL2_INCLUDE_DIR} ${SDL2_INCLUDE_DIRS})
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
   # Windows.h defines to avoid as many issues as possible.
   add_compile_definitions(WIN32_LEAN_AND_MEAN NOMINMAX NODRAWTEXT NOBITMAP NOMCX NOSERVICE PRIMARY_HOG=\"d3-win.hog\"