https://bugs.gentoo.org/959093
Missing include for malloc and getenv
--- a/src/rmd_jack.c
+++ b/src/rmd_jack.c
@@ -31,6 +31,7 @@
 #include <pthread.h>
 
 #include <string.h>
+#include <stdlib.h>
 
 #ifdef HAVE_LIBJACK