Add gflags dependency

third_party/gflags/gen/posix/include/private/config.h

Index: third_party/gflags/gen/posix/include/private/config.h
diff --git a/third_party/gflags/gen/posix/include/private/config.h b/third_party/gflags/gen/posix/include/private/config.h
new file mode 100644
index 0000000000000000000000000000000000000000..98d8e1abd15d392b80e0f48d5ec488a316ceaab9
--- /dev/null
+++ b/third_party/gflags/gen/posix/include/private/config.h
@@ -0,0 +1,110 @@
+/* src/config.h.  Generated from config.h.in by configure.  */
+/* src/config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Always the empty-string on non-windows systems. On windows, should be
+   "__declspec(dllexport)". This way, when we compile the dll, we export our
+   functions/classes. It's safe to define this here because config.h is only
+   used internally, to compile the DLL, and every DLL source file #includes
+   "config.h" before anything else. */
+#define GFLAGS_DLL_DECL /**/
+
+/* Namespace for Google classes */
+#define GOOGLE_NAMESPACE ::google
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#define HAVE_DLFCN_H 1
+
+/* Define to 1 if you have the <fnmatch.h> header file. */
+#define HAVE_FNMATCH_H 1
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#define HAVE_INTTYPES_H 1
+
+/* Define to 1 if you have the <memory.h> header file. */
+#define HAVE_MEMORY_H 1
+
+/* define if the compiler implements namespaces */
+#define HAVE_NAMESPACES 1
+
+/* Define if you have POSIX threads libraries and header files. */
+#define HAVE_PTHREAD 1
+
+/* Define to 1 if you have the `putenv' function. */
+#define HAVE_PUTENV 1
+
+/* Define to 1 if you have the `setenv' function. */
+#define HAVE_SETENV 1
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#define HAVE_STDINT_H 1
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#define HAVE_STDLIB_H 1
+
+/* Define to 1 if you have the <strings.h> header file. */
+#define HAVE_STRINGS_H 1
+
+/* Define to 1 if you have the <string.h> header file. */
+#define HAVE_STRING_H 1
+
+/* Define to 1 if you have the `strtoll' function. */
+#define HAVE_STRTOLL 1
+
+/* Define to 1 if you have the `strtoq' function. */
+#define HAVE_STRTOQ 1
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#define HAVE_SYS_STAT_H 1
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#define HAVE_SYS_TYPES_H 1
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#define HAVE_UNISTD_H 1
+
+/* define if your compiler has __attribute__ */
+#define HAVE___ATTRIBUTE__ 1
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#define LT_OBJDIR ".libs/"
+
+/* Name of package */
+#define PACKAGE "gflags"
+
+/* Define to the address where bug reports for this package should be sent. */
+#define PACKAGE_BUGREPORT "opensource@google.com"
+
+/* Define to the full name of this package. */
+#define PACKAGE_NAME "gflags"
+
+/* Define to the full name and version of this package. */
+#define PACKAGE_STRING "gflags 1.5"
+
+/* Define to the one symbol short name of this package. */
+#define PACKAGE_TARNAME "gflags"
+
+/* Define to the home page for this package. */
+#define PACKAGE_URL ""
+
+/* Define to the version of this package. */
+#define PACKAGE_VERSION "1.5"
+
+/* Define to necessary symbol if this constant uses a non-standard name on
+   your system. */
+/* #undef PTHREAD_CREATE_JOINABLE */
+
+/* Define to 1 if you have the ANSI C header files. */
+#define STDC_HEADERS 1
+
+/* the namespace where STL code like vector<> is defined */
+#define STL_NAMESPACE std
+
+/* Version number of package */
+#define VERSION "1.5"
+
+/* Stops putting the code inside the Google namespace */
+#define _END_GOOGLE_NAMESPACE_ }
+
+/* Puts following code inside the Google namespace */
+#define _START_GOOGLE_NAMESPACE_ namespace google {