Use `make install` for QuickJS. Instead of `git clone`ing in a Makefile target, use git submodules.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "QuickJS"]
+	path = QuickJS
+	url = https://github.com/JerrySievert/QuickJS

Makefile

@@ -35,16 +35,16 @@ $(duktape):
 	cd dep && $(UNTAR) ../duktape-2.4.0.tar.xz
 
 # QuickJS
-quickjs := dep/QuickJS/libquickjs.a
+quickjs := dep/lib/quickjs/libquickjs.a
 DEPS += $(quickjs)
 OBJECTS += $(quickjs)
-FLAGS += -Idep/QuickJS
-LDFLAGS += -Ldep/QuickJS -lquickjs
-MAKEQJSFLAGS :=
-
+QUICKJS_MAKE_FLAGS += prefix="$(DEP_PATH)"
+ifdef ARCH_WIN
+	QUICKJS_MAKE_FLAGS += CONFIG_WIN32=y
+endif
 $(quickjs):
-	cd dep && git clone "https://github.com/JerrySievert/QuickJS"
-	cd dep/QuickJS && $(MAKE) $(MAKEQJSFLAGS)
+	cd QuickJS && $(MAKE) $(QUICKJS_MAKE_FLAGS)
+	cd QuickJS && $(MAKE) $(QUICKJS_MAKE_FLAGS) install
 
 # # LuaJIT
 # luajit := dep/lib/luajit.a
@@ -99,7 +99,3 @@ $(quickjs):
 
 
 include $(RACK_DIR)/plugin.mk
-
-ifdef ARCH_WIN
-	MAKEQJSFLAGS += CONFIG_WIN32=y
-endif

QuickJS

@@ -0,0 +1 @@
+Subproject commit 3aefcde48ae7698b4d6704b09a071d07a8d8019d

src/QuickJSEngine.cpp

@@ -1,5 +1,5 @@
 #include "ScriptEngine.hpp"
-#include <quickjs.h>
+#include <quickjs/quickjs.h>
 
 static JSClassID QuickJSEngineClass;
 
@@ -189,9 +189,16 @@ struct QuickJSEngine : ScriptEngine {
     JS_SetPropertyStr(ctx, global_obj, "block", blockIdx);
 
     // this is a horrible hack to get QuickJS to allocate the correct types
-    std::string updateTypes = "for (var i = 0; i < 6; i++) { block.inputs[i] = new Float32Array(block.inputs[i]); block.outputs[i] = new Float32Array(block.outputs[i]); " \
-      "block.lights[i] = new Float32Array(block.lights[i]); block.switchLights[i] = new Float32Array(block.switchLights[i]); } " \
-      "block.knobs = new Float32Array(block.knobs); block.switches = new Uint8Array(block.switches);";
+    static const std::string updateTypes = R"(
+    for (var i = 0; i < 6; i++) {
+      block.inputs[i] = new Float32Array(block.inputs[i]);
+      block.outputs[i] = new Float32Array(block.outputs[i]);
+      block.lights[i] = new Float32Array(block.lights[i]);
+      block.switchLights[i] = new Float32Array(block.switchLights[i]);
+    }
+    block.knobs = new Float32Array(block.knobs);
+    block.switches = new Uint8Array(block.switches);
+    )";
 
     JSValue hack = JS_Eval(ctx, updateTypes.c_str(), updateTypes.size(), "QuickJS Hack", 0);
     if (JS_IsException(hack)) {