https://bugs.gentoo.org/943949
Correct signal handler signatures.
Also prevent unexpected environment modification
by strdup'ing new environment. Mutes const qualifier
discard warning, too.
--- a/main.c
+++ b/main.c
@@ -214,19 +214,19 @@
 }
 
 void
-handle_sigalrm()
+handle_sigalrm(int)
 {
     got_sigalrm = 1;
 }
 
 void
-handle_sigchld()
+handle_sigchld(int)
 {
     got_sigchld = 1;
 }
 
 void
-handle_sigusr1()
+handle_sigusr1(int)
 {
     got_sigusr1 = 1;
 }
--- a/runjob.c
+++ b/runjob.c
@@ -86,7 +86,7 @@
 static void
 xputenv(const char *s)
 {
-    if (putenv(s)) die_e("Can't set the environment");
+    if (putenv(strdup(s))) die_e("Can't set the environment");
 }
 
 static void