diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 256d121c77dd5..7ec2c074cc626 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2016-11-29  Waldemar Brodkorb  <wbx@openadk.org>
+
+	* config/bfin/linux.h (CPP_SPEC): Define.
+
 2016-11-29  Martin Sebor  <msebor@redhat.com>
 
 	PR tree-optimization/78512
diff --git a/gcc/config/bfin/linux.h b/gcc/config/bfin/linux.h
index c02ff44c30ab4..09224937a165a 100644
--- a/gcc/config/bfin/linux.h
+++ b/gcc/config/bfin/linux.h
@@ -38,6 +38,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   "%{static:--start-group} %{mfast-fp:-lbffastfp} %G %L %{static:--end-group} \
    %{!static:%{mfast-fp:-lbffastfp} %G}"
 
+#undef CPP_SPEC
+#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
+
 #undef LINK_SPEC
 #define LINK_SPEC "\
   %{mfdpic: -m elf32bfinfd -z text} %{shared} %{pie} \