Issue #13402 has been reported by shyouhei (Shyouhei Urabe).

----------------------------------------
Bug #13402: [PATCH] fix --with-gmp (broken by r57490)
https://bugs.ruby-lang.org/issues/13402

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
```
From 1ff8c57aee9d777d114a0f961139510ee93dc9c5 Mon Sep 17 00:00:00 2001
From: "Urabe, Shyouhei" <shyouhei / ruby-lang.org>
Date: Wed, 5 Apr 2017 09:56:09 +0900
Subject: [PATCH] fix --with-gmp (broken by r57490)

Looking at the generated shell script (also the autoconf manual), it
seems AC_SEARCH_LIBS() m4 macro does not define HAVE_LIBsomething C
preprocessor macros, unlike AC_CHECK_LIB() which does define them.
This previous change effectively killed building with GMP because
building that mode depends on existence of HAVE_LIBGMP.

Signed-off-by: Urabe, Shyouhei <shyouhei / ruby-lang.org>
---
 configure.in | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/configure.in b/configure.in
index 48a10811a0..1dfec8b2d3 100644
--- a/configure.in
+++ b/configure.in
@@ -1386,13 +1386,15 @@ AC_ARG_WITH([gmp],
 AS_IF([test "x$with_gmp" != xno],
   [AC_CHECK_HEADERS(gmp.h)
    AS_IF([test "x$ac_cv_header_gmp_h" != xno],
-     AC_SEARCH_LIBS([__gmpz_init], [gmp]))])
+     AC_SEARCH_LIBS([__gmpz_init], [gmp],
+       [AC_DEFINE(HAVE_LIBGMP, 1)]))])
 
 AC_ARG_WITH([jemalloc],
   [AS_HELP_STRING([--with-jemalloc],[use jemalloc allocator])],
   [with_jemalloc=$withval], [with_jemalloc=no])
 AS_IF([test "x$with_jemalloc" = xyes],[
-  AC_SEARCH_LIBS([malloc_conf], [jemalloc], [], [with_jemalloc=no])
+  AC_SEARCH_LIBS([malloc_conf], [jemalloc],
+    [AC_DEFINE(HAVE_LIBJEMALLOC, 1)], [with_jemalloc=no])
   AC_CHECK_HEADER(jemalloc/jemalloc.h, [
     AC_DEFINE(RUBY_ALTERNATIVE_MALLOC_HEADER, [<jemalloc/jemalloc.h>])
   ])
-- 
2.12.2

```



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