diff --git a/Makefile b/Makefile
index 4155985f..9ba2c480 100644
--- a/Makefile
+++ b/Makefile
@@ -53,4 +53,9 @@ watchdocs:
 gh-pages: docs
 	@ cp -r build/docs/. build/gh-pages
 
+# Build amalgamation of all Wren library files.
+wren.c: src/include/wren.h src/vm/*.h src/vm/*.c
+	./script/generate_amalgamation.py > $@
+
+.DELETE_ON_ERROR: wren.c
 .PHONY: debug release all clean test builtin docs watchdocs gh-pages
diff --git a/script/generate_amalgamation.py b/script/generate_amalgamation.py
new file mode 100755
index 00000000..6f862e90
--- /dev/null
+++ b/script/generate_amalgamation.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+
+import sys
+from os.path import basename, dirname, join, realpath
+from glob import iglob
+import re
+
+INCLUDE_PATTERN = re.compile(r'^\s*#include "([\w.]+)"')
+GUARD_PATTERN = re.compile(r'^#ifndef wren(_\w+)?_h$')
+WREN_DIR = dirname(dirname(realpath(__file__)))
+
+seen_files = set()
+out = sys.stdout
+
+# Prints a plain text file, adding comment markers.
+def add_comment_file(filename):
+  with open(filename, 'r') as f:
+    for line in f:
+      out.write('// ')
+      out.write(line)
+
+# Prints the given C source file, recursively resolving local #includes.
+def add_file(filename):
+  bname = basename(filename)
+  # Only include each file at most once.
+  if bname in seen_files:
+    return
+  once = False
+  path = dirname(filename)
+
+  out.write('// Begin file "{0}"\n'.format(filename))
+  with open(filename, 'r') as f:
+    for line in f:
+      m = INCLUDE_PATTERN.match(line)
+      if m:
+        add_file(join(path, m.group(1)))
+      else:
+        out.write(line)
+      if GUARD_PATTERN.match(line):
+        once = True
+  out.write('// End file "{0}"\n'.format(filename))
+
+  # Only skip header files which use #ifndef guards.
+  # This is necessary because of the X Macro technique.
+  if once:
+    seen_files.add(bname)
+
+# Print license on top.
+add_comment_file(join(WREN_DIR, 'LICENSE'))
+out.write('\n')
+# Source files.
+add_file(join(WREN_DIR, 'src', 'include', 'wren.h'))
+# Must be included here because of conditional compilation.
+add_file(join(WREN_DIR, 'src', 'vm', 'wren_debug.h'))
+for f in iglob(join(WREN_DIR, 'src', 'vm', '*.c')):
+  add_file(f)
diff --git a/script/generate_builtins.py b/script/generate_builtins.py
index 56d6e1bb..99c8bfe1 100755
--- a/script/generate_builtins.py
+++ b/script/generate_builtins.py
@@ -4,7 +4,7 @@ import glob
 import os.path
 import re
 
-PATTERN = re.compile(r'libSource =\n("(.|[\n])*?);')
+PATTERN = re.compile(r'LibSource =\n("(.|[\n])*?);')
 
 def copy_builtin(filename):
   name = os.path.basename(filename)
@@ -24,7 +24,7 @@ def copy_builtin(filename):
   # in the C string literal.
   wren_source = wren_source.replace('\\', '\\\\')
 
-  constant = "libSource =\n" + wren_source + ";"
+  constant = "LibSource =\n" + wren_source + ";"
 
   with open("src/vm/wren_" + name + ".c", "r") as f:
     c_source = f.read()
diff --git a/src/vm/wren_core.c b/src/vm/wren_core.c
index 9fce8d68..5d0e2b28 100644
--- a/src/vm/wren_core.c
+++ b/src/vm/wren_core.c
@@ -11,7 +11,7 @@
 #include "wren_value.h"
 
 // This string literal is generated automatically from core. Do not edit.
-static const char* libSource =
+static const char* coreLibSource =
 "class Bool {}\n"
 "class Fiber {}\n"
 "class Fn {}\n"
@@ -485,7 +485,7 @@ DEF_PRIMITIVE(fn_arity)
   RETURN_NUM(AS_FN(args[0])->arity);
 }
 
-static PrimitiveResult callFunction(WrenVM* vm, Value* args, int numArgs)
+static PrimitiveResult callFn(WrenVM* vm, Value* args, int numArgs)
 {
   ObjFn* fn;
   if (IS_CLOSURE(args[0]))
@@ -502,23 +502,23 @@ static PrimitiveResult callFunction(WrenVM* vm, Value* args, int numArgs)
   return PRIM_CALL;
 }
 
-DEF_PRIMITIVE(fn_call0) { return callFunction(vm, args, 0); }
-DEF_PRIMITIVE(fn_call1) { return callFunction(vm, args, 1); }
-DEF_PRIMITIVE(fn_call2) { return callFunction(vm, args, 2); }
-DEF_PRIMITIVE(fn_call3) { return callFunction(vm, args, 3); }
-DEF_PRIMITIVE(fn_call4) { return callFunction(vm, args, 4); }
-DEF_PRIMITIVE(fn_call5) { return callFunction(vm, args, 5); }
-DEF_PRIMITIVE(fn_call6) { return callFunction(vm, args, 6); }
-DEF_PRIMITIVE(fn_call7) { return callFunction(vm, args, 7); }
-DEF_PRIMITIVE(fn_call8) { return callFunction(vm, args, 8); }
-DEF_PRIMITIVE(fn_call9) { return callFunction(vm, args, 9); }
-DEF_PRIMITIVE(fn_call10) { return callFunction(vm, args, 10); }
-DEF_PRIMITIVE(fn_call11) { return callFunction(vm, args, 11); }
-DEF_PRIMITIVE(fn_call12) { return callFunction(vm, args, 12); }
-DEF_PRIMITIVE(fn_call13) { return callFunction(vm, args, 13); }
-DEF_PRIMITIVE(fn_call14) { return callFunction(vm, args, 14); }
-DEF_PRIMITIVE(fn_call15) { return callFunction(vm, args, 15); }
-DEF_PRIMITIVE(fn_call16) { return callFunction(vm, args, 16); }
+DEF_PRIMITIVE(fn_call0) { return callFn(vm, args, 0); }
+DEF_PRIMITIVE(fn_call1) { return callFn(vm, args, 1); }
+DEF_PRIMITIVE(fn_call2) { return callFn(vm, args, 2); }
+DEF_PRIMITIVE(fn_call3) { return callFn(vm, args, 3); }
+DEF_PRIMITIVE(fn_call4) { return callFn(vm, args, 4); }
+DEF_PRIMITIVE(fn_call5) { return callFn(vm, args, 5); }
+DEF_PRIMITIVE(fn_call6) { return callFn(vm, args, 6); }
+DEF_PRIMITIVE(fn_call7) { return callFn(vm, args, 7); }
+DEF_PRIMITIVE(fn_call8) { return callFn(vm, args, 8); }
+DEF_PRIMITIVE(fn_call9) { return callFn(vm, args, 9); }
+DEF_PRIMITIVE(fn_call10) { return callFn(vm, args, 10); }
+DEF_PRIMITIVE(fn_call11) { return callFn(vm, args, 11); }
+DEF_PRIMITIVE(fn_call12) { return callFn(vm, args, 12); }
+DEF_PRIMITIVE(fn_call13) { return callFn(vm, args, 13); }
+DEF_PRIMITIVE(fn_call14) { return callFn(vm, args, 14); }
+DEF_PRIMITIVE(fn_call15) { return callFn(vm, args, 15); }
+DEF_PRIMITIVE(fn_call16) { return callFn(vm, args, 16); }
 
 DEF_PRIMITIVE(fn_toString)
 {
@@ -1331,7 +1331,7 @@ void wrenInitializeCore(WrenVM* vm)
   //     '---------'   '--------------'   -'
 
   // The rest of the classes can now be defined normally.
-  wrenInterpret(vm, "", libSource);
+  wrenInterpret(vm, "", coreLibSource);
 
   vm->boolClass = AS_CLASS(wrenFindVariable(vm, "Bool"));
   PRIMITIVE(vm->boolClass, "toString", bool_toString);
diff --git a/src/vm/wren_debug.c b/src/vm/wren_debug.c
index 7e243157..cf50f7d6 100644
--- a/src/vm/wren_debug.c
+++ b/src/vm/wren_debug.c
@@ -333,6 +333,9 @@ static int dumpInstruction(WrenVM* vm, ObjFn* fn, int i, int* lastLine)
   // Return how many bytes this instruction takes, or -1 if it's an END.
   if (code == CODE_END) return -1;
   return i - start;
+
+  #undef READ_BYTE
+  #undef READ_SHORT
 }
 
 int wrenDumpInstruction(WrenVM* vm, ObjFn* fn, int i)
diff --git a/src/vm/wren_io.c b/src/vm/wren_io.c
index ff079f02..8463ca8d 100644
--- a/src/vm/wren_io.c
+++ b/src/vm/wren_io.c
@@ -10,7 +10,7 @@
 #define MAX_READ_LEN 1024
 
 // This string literal is generated automatically from io.wren. Do not edit.
-static const char* libSource =
+static const char* ioLibSource =
 "class IO {\n"
 "  static print {\n"
 "    IO.writeString_(\"\n\")\n"
@@ -142,7 +142,7 @@ static void ioTime(WrenVM* vm)
 
 void wrenLoadIOLibrary(WrenVM* vm)
 {
-  wrenInterpret(vm, "", libSource);
+  wrenInterpret(vm, "", ioLibSource);
 }
 
 WrenForeignMethodFn wrenBindIOForeignMethod(WrenVM* vm, const char* className,
diff --git a/src/vm/wren_meta.c b/src/vm/wren_meta.c
index ff8cd10a..6f20f6fd 100644
--- a/src/vm/wren_meta.c
+++ b/src/vm/wren_meta.c
@@ -7,7 +7,7 @@
 #include "wren_primitive.h"
 
 // This string literal is generated automatically from meta.wren. Do not edit.
-static const char* libSource =
+static const char* metaLibSource =
 "class Meta {}\n";
 
 DEF_PRIMITIVE(meta_eval)
@@ -43,7 +43,7 @@ DEF_PRIMITIVE(meta_eval)
 
 void wrenLoadMetaLibrary(WrenVM* vm)
 {
-  wrenInterpret(vm, "", libSource);
+  wrenInterpret(vm, "", metaLibSource);
 
   // The methods on "Meta" are static, so get the metaclass for the Meta class.
   ObjClass* meta = AS_CLASS(wrenFindVariable(vm, "Meta"))->obj.classObj;
diff --git a/src/vm/wren_vm.c b/src/vm/wren_vm.c
index 26f424b7..d4c81a1b 100644
--- a/src/vm/wren_vm.c
+++ b/src/vm/wren_vm.c
@@ -1219,6 +1219,8 @@ static bool runInterpreter(WrenVM* vm)
   UNREACHABLE();
   return false;
 }
+#undef READ_BYTE
+#undef READ_SHORT
 
 // Creates an [ObjFn] that invokes a method with [signature] when called.
 static ObjFn* makeCallStub(WrenVM* vm, ObjModule* module, const char* signature)