--- a/src/runtime/ppc-linux-os.c
+++ b/src/runtime/ppc-linux-os.c
@@ -33,6 +33,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 #include <sys/prctl.h>
+#include <asm/ptrace.h>

 #include "validate.h"
 #include "ppc-linux-mcontext.h"
--- a/src/runtime/os-common.c
+++ b/src/runtime/os-common.c
@@ -31,6 +31,9 @@
 #if defined(LISP_FEATURE_OS_PROVIDES_DLOPEN) && !defined(LISP_FEATURE_WIN32)
 # include <dlfcn.h>
 #endif
+#if defined(__powerpc__)
+# include <asm/ptrace.h>
+#endif

 /*
  * historically, this used sysconf to select the runtime page size
--- a/src/runtime/ppc-arch.c
+++ b/src/runtime/ppc-arch.c
@@ -10,6 +10,7 @@
  */

 #include <stdio.h>
+#include <asm/ptrace.h>

 #include "sbcl.h"
 #include "arch.h"