diff --git a/CMakeLists.txt b/CMakeLists.txt
index cdd5e12..ad8266b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.24)
+cmake_minimum_required(VERSION 3.16)
 project(skeldal)
 
 # Najít SDL2 knihovnu
diff --git a/game/advconfig.c b/game/advconfig.c
index 85d18c3..26e56a5 100644
--- a/game/advconfig.c
+++ b/game/advconfig.c
@@ -2,7 +2,7 @@
 #include "advconfig.h"
 
 
-#include <malloc.h>
+#include <stdlib.h>
 #include <string.h>
 
 
diff --git a/game/builder.c b/game/builder.c
index e9d253c..a863fa4 100644
--- a/game/builder.c
+++ b/game/builder.c
@@ -237,7 +237,7 @@ void chveni(int i)
   pos=!pos;
   }
 
-void objekty_mimo()
+void objekty_mimo(THE_TIMER *t)
   {
   schovej_mysku();
   ukaz_kompas(1);
diff --git a/game/globals.h b/game/globals.h
index 4305e99..47676bd 100644
--- a/game/globals.h
+++ b/game/globals.h
@@ -671,7 +671,7 @@ typedef void (*TIMER_PROC)(THE_TIMER *t);
 THE_TIMER *add_to_timer(int id,int delay,int maxcall,TIMER_PROC proc);
 void delete_from_timer(int id);
 THE_TIMER *find_timer(int id);
-void objekty_mimo(void);
+void objekty_mimo(THE_TIMER *t);
 void mouse_set_cursor(int cursor);
 #define FONT_TSHADOW 0x10000
 #define FONT_TSHADOW_GRAY 0x30000
@@ -1006,7 +1006,7 @@ void zmen_skupinu(THUMAN *p);
 void add_to_group(int num);
 void group_all(void);
 const void *build_items_called(const void *p, int32_t *s);
-void real_regeneration(void); //regenerace postav behem hry v realu (pouze kondice a mana)
+void real_regeneration(THE_TIMER *t); //regenerace postav behem hry v realu (pouze kondice a mana)
 char sleep_regenerace(THUMAN *p);  //regenerace postav behem spani
 char check_jidlo_voda(THUMAN *p);
 void prepocitat_postavu(THUMAN *human_selected);
diff --git a/game/inv.c b/game/inv.c
index daebf73..cdae9ac 100644
--- a/game/inv.c
+++ b/game/inv.c
@@ -1117,7 +1117,7 @@ char sleep_regenerace(THUMAN *p)
   }
 
 
-void real_regeneration()
+void real_regeneration(THE_TIMER *t)
   {
   int i;
   THUMAN *p;
diff --git a/game/skeldal.c b/game/skeldal.c
index 7695d03..6a3c1fa 100644
--- a/game/skeldal.c
+++ b/game/skeldal.c
@@ -507,7 +507,7 @@ void clrscr(void)
 
 
 
-void back_music(void)
+void back_music(THE_TIMER *t)
   {
   mix_back_sound(0);
   }
@@ -577,7 +577,7 @@ void timming(EVENT_MSG *msg,void **data)
         THE_TIMER *z;
 
         z=&timer_tree;while(z->next!=p && z->next!=NULL) z=z->next;
-        if (z->next==NULL) return NULL;
+        if (z->next==NULL) return;
         }
      q=p;
      }
@@ -639,7 +639,7 @@ void hold_timer(int id,char hld)
   SEND_LOG("(TIMER) Timer hold id: %d status: %s",id,hld?"Hold":"Unhold");
   }
 
-THE_TIMER *add_to_timer(int id,int delay,int maxcall,void *proc)
+THE_TIMER *add_to_timer(int id,int delay,int maxcall,TIMER_PROC proc)
   {
   THE_TIMER *q;
 
diff --git a/platform/sdl/sdl_context.cpp b/platform/sdl/sdl_context.cpp
index 67e8191..bc7043f 100644
--- a/platform/sdl/sdl_context.cpp
+++ b/platform/sdl/sdl_context.cpp
@@ -8,6 +8,7 @@
 #include <cmath>
 #include <iostream>
 #include <stdexcept>
+#include <sstream>
 void SDLContext::SDL_Deleter::operator ()(SDL_Window* window) {
     SDL_DestroyWindow(window);
 }
@@ -508,7 +509,7 @@ SDL_Rect SDLContext::get_window_aspect_rect() const {
     SDL_Rect w;
     int ww;
     int wh;
-    SDL_GetWindowSizeInPixels(_window.get(), &ww, &wh);
+    SDL_GetWindowSize(_window.get(), &ww, &wh);
     if (aspect_x && aspect_y) {
         int apw  = wh * aspect_x / aspect_y;
         int aph =  ww * aspect_y / aspect_x;
@@ -575,7 +576,6 @@ void SDLContext::set_quit_callback(std::function<void()> fn) {
 }
 
 SDLContext::AudioInfo SDLContext::init_audio(const AudioConfig &config, SDL_AudioCallback cb, void *cb_ctx) {
-    char buff[256];
     _audio.reset();
     SDL_AudioSpec aspec = {};
     aspec.callback = cb;
@@ -587,8 +587,19 @@ SDLContext::AudioInfo SDLContext::init_audio(const AudioConfig &config, SDL_Audi
     SDL_AudioSpec obtaied = {};
     auto id = SDL_OpenAudioDevice(config.audioDevice, 0, &aspec, &obtaied, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE|SDL_AUDIO_ALLOW_SAMPLES_CHANGE);
     if (id < 1) {
-        snprintf(buff, sizeof(buff), "SDL Error create audio: %s\n", SDL_GetError());
-        throw std::runtime_error(buff);
+        std::ostringstream err;
+        err << "SDL Error create audio:" << SDL_GetError() << "\n";
+        int n = SDL_GetNumAudioDevices(0);
+        if (n == 0) err << "No audio devices are available" << "\n";
+        else {
+            err << "Available audio devices:";
+            char sep = ' ';
+            for (int i = 0; i < n; ++i) {
+                err << sep << SDL_GetAudioDeviceName(i, 0);
+                sep = ',';
+            }
+        }
+        throw std::runtime_error(err.str());
     }
     _audio.reset(reinterpret_cast<void *>(id));