From: Jory A. Pratt <anarchy@gentoo.org>

getcontext is only avaliable on glibc systems

diff --git a/tools/profiler/core/platform-linux-android.cpp b/tools/profiler/core/platform-linux-android.cpp
--- a/tools/profiler/core/platform-linux-android.cpp
+++ b/tools/profiler/core/platform-linux-android.cpp
@@ -529,14 +529,16 @@ PlatformInit(PSLockRef aLock)
 // Context used by synchronous samples. It's safe to have a single one because
 // only one synchronous sample can be taken at a time (due to
 // profiler_get_backtrace()'s PSAutoLock).
 ucontext_t sSyncUContext;
 
 void
 Registers::SyncPopulate()
 {
+#if defined(__GLIBC__)
   if (!getcontext(&sSyncUContext)) {
     PopulateRegsFromContext(*this, &sSyncUContext);
   }
+#endif
 }
 #endif