Fix compilation failure under ENABLE_CHECKING.

 src/alloc.c [ENABLE_CHECKING]: Include signal.h, since we need SIGABRT.

Fixes: debbugs:12327

1 files changed, 4 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
index aaf2f0846dc..33dc68df48e 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -26,6 +26,10 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <limits.h>             /* For CHAR_BIT.  */
 #include <setjmp.h>
 
+#ifdef ENABLE_CHECKING
+#include <signal.h>             /* For SIGABRT. */
+#endif
+
 #ifdef HAVE_PTHREAD
 #include <pthread.h>
 #endif