silence avah_compat nag with AVAHI_COMPAT_NOWARN=1

uses putenv; conditional compilation set in CMakelists.txt

CMakeLists.txt

@@ -4,6 +4,8 @@ project(uxplay)
 
 set (CMAKE_CXX_STANDARD 11)
 
+add_definitions(-DAVAHI_COMPAT_NOWARN)
+
 find_package(X11 REQUIRED)
 link_libraries(${X11_LIBRARIES})
 include_directories(${X11_INCLUDE_DIR})

uxplay.cpp

@@ -106,6 +106,12 @@ int main(int argc, char *argv[]) {
     bool use_audio = true;
     bool debug_log = DEFAULT_DEBUG_LOG;
 
+#ifdef AVAHI_COMPAT_NOWARN
+    //suppress avahi_compat nag message
+    char avahi_compat_nowarn[] = "AVAHI_COMPAT_NOWARN==1";
+    putenv(avahi_compat_nowarn);
+#endif
+    
     // Parse arguments
     for (int i = 1; i < argc; i++) {
         std::string arg(argv[i]);