commit 470b58e15dc6f406899b1695aec7fc98986b8f14
Author: Jan Engelhardt <jengelh@inai.de>
Date:   Fri Jan 27 09:56:44 2017 +0100

    build: resolve compiler warning for wait(2)
    
    src/unit.c: In function "wait_for_child_process":
    src/unit.c:229:5: warning: implicit declaration of function "wait" [-Wimplicit-function-declaration]
         wait(&status);

diff --git a/tests/cgreen/src/unit.c b/tests/cgreen/src/unit.c
index 7753ff1..bdd236f 100644
--- a/tests/cgreen/src/unit.c
+++ b/tests/cgreen/src/unit.c
@@ -9,6 +9,7 @@
 #include <stdarg.h>
 #include <unistd.h>
 #include <signal.h>
+#include <sys/wait.h>
 
 enum {test_function, test_suite};