Fix alternate stack test in configure

* configure.ac (emacs_cv_alternate_stack): Include <stdlib.h>
for 'malloc's prototype.

1 files changed, 1 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index ac29f351fb3..df19508d3d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5248,6 +5248,7 @@ AC_CACHE_CHECK([whether signals can be handled on alternate stack],
                [emacs_cv_alternate_stack],
   [AC_COMPILE_IFELSE(
      [AC_LANG_PROGRAM([[#include <signal.h>
+                        #include <stdlib.h>
                       ]],
                       [[stack_t ss;
                         struct sigaction sa;