ttyrec: add implicit declaration flag

Formula/t/ttyrec.rb

@@ -31,15 +31,22 @@ class Ttyrec < Formula
  sha256 "76b8153476565c5c548aa04c2eeaa7c7ec8c1385bcf8b511c68915a3a126fdeb"
  end
 
+ # Fixes "ttyrec.c:209:20: error: storage size of ‘status’ isn’t known";
+ # check `man 2 wait3`.
+ patch :DATA
+
  def install
+ # Fix compile with newer Clang
+ ENV.append_to_cflags "-Wno-implicit-function-declaration" if DevelopmentTools.clang_build_version >= 1403
+
  # macOS has openpty() in <util.h>
  # Reported by email to [email protected] on 2017-12-20
  inreplace "ttyrec.c", "<libutil.h>", "<util.h>" if OS.mac?
 
  # openpty is a BSD function
- cflags = OS.mac? ? "-DHAVE_openpty" : nil
+ ENV.append_to_cflags "-DHAVE_openpty" if OS.mac?
 
- system "make", "CFLAGS=#{cflags}"
+ system "make", "CFLAGS=#{ENV.cflags}"
  bin.install %w[ttytime ttyplay ttyrec]
  man1.install Dir["*.1"]
  end
@@ -50,3 +57,19 @@ def install
  end
  end
 end
+
+__END__
+--- a/ttyrec.c
++++ b/ttyrec.c
+@@ -203,11 +203,7 @@ doinput()
+ void
+ finish()
+ {
+-#if defined(SVR4)
+ int status;
+-#else /* !SVR4 */
+- union wait status;
+-#endif /* !SVR4 */
+ register int pid;
+ register int die = 0;
+