diff --git a/versions.d b/versions.d
new file mode 100644
index 0000000..ea1129f
--- /dev/null
+++ b/versions.d
@@ -0,0 +1,84 @@
+
+/**
+ * Predefined version identifiers
+ */
+immutable string[] versions = [
+    "DigitalMars",
+    "GNU",
+    "LDC",
+    "SDC",
+    "Windows",
+    "Win32",
+    "Win64",
+    "linux",
+    "OSX",
+    "FreeBSD",
+    "OpenBSD",
+    "NetBSD",
+    "DragonFlyBSD",
+    "BSD",
+    "Solaris",
+    "Posix",
+    "AIX",
+    "Haiku",
+    "SkyOS",
+    "SysV3",
+    "SysV4",
+    "Hurd",
+    "Android",
+    "Cygwin",
+    "X86",
+    "X86_64",
+    "ARM",
+    "ARM_Thumb",
+    "ARM_SoftFloat",
+    "ARM_SoftFP",
+    "ARM_HardFloat",
+    "AArch64",
+    "PPC",
+    "PPC_SoftFloat",
+    "PPC_HardFloat",
+    "PPC64",
+    "IA64",
+    "MIPS32",
+    "MIPS64",
+    "MIPS_O32",
+    "MIPS_N32",
+    "MIPS_O64",
+    "MIPS_N64",
+    "MIPS_EABI",
+    "MIPS_SoftFloat",
+    "MIPS_HardFloat",
+    "SPARC",
+    "SPARC_V8Plus",
+    "SPARC_SoftFloat",
+    "SPARC_HardFloat",
+    "SPARC64",
+    "S390",
+    "S390X",
+    "HPPA",
+    "HPPA64",
+    "SH",
+    "SH64",
+    "Alpha",
+    "Alpha_SoftFloat",
+    "Alpha_HardFloat",
+    "LittleEndian",
+    "BigEndian",
+    "D_Coverage",
+    "D_Ddoc",
+    "D_InlineAsm_X86",
+    "D_InlineAsm_X86_64",
+    "D_LP64",
+    "D_X32",
+    "D_HardFloat",
+    "D_SoftFloat",
+    "D_PIC",
+    "D_SIMD",
+    "D_Version2",
+    "D_NoBoundsChecks",
+    "unittest",
+    "assert",
+    "none",
+    "all"
+];