fix compile errors

common/headless_view.hpp

@@ -29,14 +29,14 @@ private:
 
 
 private:
-#ifdef LLMR_USE_CGL
+#if LLMR_USE_CGL
     CGLContextObj gl_context;
     GLuint fbo = 0;
     GLuint fbo_depth_stencil = 0;
     GLuint fbo_color = 0;
 #endif
 
-#ifdef LLMR_USE_GLX
+#if LLMR_USE_GLX
     GLXContext gl_context = nullptr;
     XVisualInfo *x_info = nullptr;
     Display *x_display = nullptr;

src/util/io.cpp

@@ -4,6 +4,7 @@
 #include <iostream>
 #include <sstream>
 #include <fstream>
+#include <stdexcept>
 
 namespace llmr {
 namespace util {

test/headless.cpp

@@ -5,9 +5,10 @@
 #include <llmr/util/io.hpp>
 #include <llmr/util/std.hpp>
 
-#include "../common/headless_view.hpp"
 #include <rapidjson/document.h>
 
+#include "../common/headless_view.hpp"
+
 const std::string base_directory = []{
     std::string fn = __FILE__;
     fn.erase(fn.find_last_of("/"));