diff --git a/BUILD.gn b/BUILD.gn
new file mode 100644
index 0000000..72097fb
--- /dev/null
+++ b/BUILD.gn
@@ -0,0 +1,84 @@
+# xp_activate32
+
+import("//build/config/precompiled_header.gni")
+import("//build/config/static_shared.gni")
+import("//build/config/win/manifest.gni")
+
+# Main executable
+executable("xp_activate32") {
+  configs -= [
+    #"//build/config/win:console",
+    #"//build/config/win:nominmax",
+  ]
+
+  configs += [
+    #"//build/config/win:windowed",
+    ":xp_activate32_config",
+  ]
+
+  deps = [
+    ":xp_activate32_sources",
+    ":xp_activate32_manifest",
+  ]
+}
+
+# Precompiled header for common C/C++ stdlib stuff
+precompiled_header("precompiled") {
+  precompiled_header = "src/stdafx.h"
+  precompiled_source = "src/stdafx.cc"
+}
+
+source_set("xp_activate32_sources") {
+  configs -= [ "//build/config/win:nominmax", ]
+
+  # Must explicitly set this for sources
+  #configs += [ "//build/config/win:windowed", ]
+
+  configs += [
+    ":xp_activate32_config",
+    #":precompiled"
+  ]
+
+  sources = [
+    "src/constants.h",
+    "src/framework.h",
+    "src/keygen.cc",
+    "src/keygen.h",
+    "src/resource.h",
+    "src/resource.rc",
+    "src/utils.cc",
+    "src/utils.h",
+    "src/xp_activate32.cc",
+    "src/xp_activate32.h",
+  ]
+}
+
+# Program-specific build config
+config("xp_activate32_config") {
+  cflags = []
+  ldflags = []
+  libs = [
+    "comctl32.lib",
+    "kernel32.lib",
+    "user32.lib",
+    "ole32.lib",
+    "oleaut32.lib",
+  ]
+}
+
+windows_manifest("xp_activate32_manifest") {
+  # No-Op on XP, but need it for running on newer systems to display warning dialog.
+  sources = [ require_administrator_manifest ]
+  # Breaks program for some reason, despite it using Unicode all throughout
+  #sources += [ unicode_manifest, ]
+
+  # Common controls was never working in the original one, finally have it working.
+  if (use_common_controls) {
+    sources += [ common_controls_manifest, ]
+  }
+}
+
+group("xp_activate32_test") {
+  testonly = true
+  public_deps = [ ]
+}
diff --git a/src/framework.h b/src/framework.h
index 39fc11a..6989071 100644
--- a/src/framework.h
+++ b/src/framework.h
@@ -2,14 +2,24 @@
 
 #include <WinSDKVer.h>
 
-#define WINVER _WIN32_WINNT_WINXP
-#define _WIN32_WINNT _WIN32_WINNT_WINXP
-#define _WIN64_WINNT _WIN32_WINNT_WS03s // Minimum version for 64 bit
-#define _WIN32_IE 0x0600 // Minimum Internet Explorer version
+#ifndef WINVER
+ #define WINVER _WIN32_WINNT_WINXP
+#endif // WINVER
+#ifndef _WIN32_WINNT
+ #define _WIN32_WINNT _WIN32_WINNT_WINXP
+#endif // _WIN32_WINNT
+#ifndef _WIN64_WINNT
+ #define _WIN64_WINNT _WIN32_WINNT_WS03s // Minimum version for 64 bit
+#endif // _WIN64_WINNT
+#ifndef _WIN32_IE
+ #define _WIN32_IE 0x0600 // Minimum Internet Explorer version
+#endif // _WIN32_IE
 
 // See https://tedwvc.wordpress.com/2014/01/01/how-to-target-xp-with-vc2012-or-vc2013-and-continue-to-use-the-windows-8-x-sdk/
 //#define _USING_V110_SDK71_
-#define _ATL_XP_TARGETING
+#ifndef _ATL_XP_TARGETING
+ #define _ATL_XP_TARGETING
+#endif // _ATL_XP_TARGETING
 
 #include <SDKDDKVer.h>