diff --git a/libc/bionic/ndk_cruft.cpp b/libc/bionic/ndk_cruft.cpp
index ed60ea4..cb9c9c9 100644
--- a/libc/bionic/ndk_cruft.cpp
+++ b/libc/bionic/ndk_cruft.cpp
@@ -32,6 +32,7 @@
 #include <ctype.h>
 #include <inttypes.h>
 #include <pthread.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/resource.h>
@@ -226,4 +227,15 @@
   return wcsstr(haystack, needle);
 }
 
+// This was removed from POSIX 2008.
+extern "C" sighandler_t bsd_signal(int signum, sighandler_t handler) {
+  return signal(signum, handler);
+}
+
+// sysv_signal() was never in POSIX.
+extern sighandler_t _signal(int signum, sighandler_t handler, int flags);
+extern "C" sighandler_t sysv_signal(int signum, sighandler_t handler) {
+  return _signal(signum, handler, SA_RESETHAND);
+}
+
 #endif