diff -urp gsl-2.2.1/configure.ac patched/configure.ac
--- gsl-2.2.1/configure.ac	2016-08-31 15:54:07.000000000 +0100
+++ patched/configure.ac	2017-01-31 14:52:10.000000000 +0000
@@ -575,10 +575,6 @@ AH_BOTTOM([#if defined(GSL_RANGE_CHECK_O
 AH_BOTTOM([#define RETURN_IF_NULL(x) if (!x) { return ; }
 ])
 
-AH_VERBATIM([GSL_DISABLE_DEPRECATED],
-[/* Disable deprecated functions and enums while building */
-#define GSL_DISABLE_DEPRECATED 1])
-
 dnl
 AC_CONFIG_FILES([            \
 Makefile                     \
--- gsl-2.2.1/config.h.in       2016-08-31 15:54:51.000000000 +0100
+++ patched/config.h.in 2017-01-31 16:01:17.000000000 +0000
@@ -1,8 +1,5 @@
 /* config.h.in.  Generated from configure.ac by autoheader.  */

-/* Disable deprecated functions and enums while building */
-#define GSL_DISABLE_DEPRECATED 1
-
 /* Define if you have inline with C99 behavior */
 #undef HAVE_C99_INLINE
