diff -up gperftools-2.6.1/src/stacktrace_powerpc-linux-inl.h.ucontextfix gperftools-2.6.1/src/stacktrace_powerpc-linux-inl.h
--- gperftools-2.6.1/src/stacktrace_powerpc-linux-inl.h.ucontextfix	2017-07-17 15:57:42.066001611 -0400
+++ gperftools-2.6.1/src/stacktrace_powerpc-linux-inl.h	2017-07-17 15:58:04.610427563 -0400
@@ -53,7 +53,8 @@
 #elif defined(HAVE_UCONTEXT_H)
 #include <ucontext.h>  // for ucontext_t
 #endif
-typedef ucontext ucontext_t;
+// no ucontext typedef on ppc64
+// typedef ucontext ucontext_t;
 
 // PowerPC64 Little Endian follows BE wrt. backchain, condition register,
 // and LR save area, so no need to adjust the reading struct.