Merge branch 'mrdomino-std-c99'

SConstruct

@@ -102,7 +102,7 @@ if env['CC'] == 'cl':
         ]
     )
 else:
-    env.MergeFlags('-std=gnu99 -Wall -Wextra -Werror -Wno-unused-parameter -Wno-attributes -Wno-unused-variable')
+    env.MergeFlags('-std=c99 -D_POSIX_C_SOURCE=200809L -Wall -Wextra -Werror -Wno-unused-parameter -Wno-attributes -Wno-unused-variable')
 
 # Linker options
 if env['PLATFORM'] == 'darwin':

src/registry.c

@@ -15,6 +15,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 
+#include <search.h>
 #include <stdlib.h>
 #include "hammer.h"
 #include "internal.h"