diff --git a/include/builddefs.in b/include/builddefs.in
index ca8f172..cc75b5d 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -102,7 +102,7 @@ GCCFLAGS = -funsigned-char -fno-strict-aliasing -Wall
 #	   -Wbitwise -Wno-transparent-union -Wno-old-initializer -Wno-decl
 
 ifeq ($(PKG_PLATFORM),linux)
-PCFLAGS = -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 $(GCCFLAGS)
+PCFLAGS = -D_GNU_SOURCE -D_XOPEN_SOURCE=500 -D_FILE_OFFSET_BITS=64 $(GCCFLAGS)
 DEPENDFLAGS = -D__linux__
 endif
 ifeq ($(PKG_PLATFORM),darwin)
diff --git a/include/linux.h b/include/linux.h
index dbfb4cf..b342e55 100644
--- a/include/linux.h
+++ b/include/linux.h
@@ -22,6 +22,7 @@
 #include <sys/ioctl.h>
 #include <sys/param.h>
 #include <sys/sysmacros.h>
+#include <sys/stat.h>
 #include <malloc.h>
 #include <getopt.h>
 #include <endian.h>