Also issues with implicit basename(3), but that is handled from the ebuild.
https://bugs.gentoo.org/861644
https://bugs.gentoo.org/870838
--- a/mixer.c
+++ b/mixer.c
@@ -29,4 +29,5 @@
 #include "audio_proc.h"
 #include "controls.h"
+#include "url.h"
 
 
@@ -40,4 +41,5 @@
 #include <time.h>
 
+int parse_file_metadata(char *filename,char **title,char **artist,char **album,char **url);
 
 short audio_buffer[BUF_SIZE];  
--- a/mixer.h
+++ b/mixer.h
@@ -157,2 +157,3 @@
 void write_logfile(cptr ch);
 void execute_update_script(cptr ch);
+void shout_streamer(void);
--- a/streams.c
+++ b/streams.c
@@ -32,4 +32,5 @@
 #include "serverlib.h"
 #include "audio_proc.h"
+#include "mixer.h"
 
 #ifdef SOUNDCARD_SUPPORT
--- a/url.h
+++ b/url.h
@@ -11,2 +11,3 @@
 int string_contains(char *string,char *seek);
 void strtoupper(char *string);
+char *url_encode(char *str, char **result_p);