--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -21,5 +21,9 @@
 #include "exec/gdbstub.h"
 #include "hw/core/tcg-cpu-ops.h"
 
+#if defined(_ARCH_PPC64) && !defined(__GLIBC__) /* musl */
+#include <asm/ptrace.h>
+#endif
+
 #include <sys/ucontext.h>
 #include <sys/resource.h>
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -25,6 +25,10 @@
 
 #ifdef CONFIG_LINUX
 #include <sys/vfs.h>
+/* musl undefs this on ppc and mips */
+#ifndef MAP_SYNC
+#define MAP_SYNC 0x80000
+#endif
 #endif
 
 size_t qemu_fd_getpagesize(int fd)