tmux 2.2 が何かおかしいので homebrew で tmux 2.1 にダウングレードする ref: http://qiita.com/__hage/items/5280e072edeb47dc8ada

file0.txt

$ brew uninstall tmux
$ brew update
$ brew tap hage/homebrew-formula
$ brew install tmux21

file1.txt

$ git clone https://github.com/Homebrew/homebrew-core.git
$ cd homebrew-core
$ git log master -- Formula/tmux.rb

file2.txt

$ git checkout 78b85

file3.diff

diff --git a/tmux21.rb b/tmux21.rb
index 9922c5c..3b0d4b7 100644
--- a/tmux21.rb
+++ b/tmux21.rb
@@ -1,4 +1,4 @@
-class Tmux < Formula
+class Tmux21 < Formula
   desc "Terminal multiplexer"
   homepage "https://tmux.github.io/"

@@ -21,14 +21,6 @@ class Tmux < Formula
     end
   end

-  bottle do
-    cellar :any
-    revision 2
-    sha256 "815920cd38a8102360f7d667271d9c724f41087dd79be433db29259390ef8011" => :el_capitan
-    sha256 "93e2156c3c7e1c9f3f4b86dd84617e7519e9bee630f1e8769e00a91aa341d274" => :yosemite
-    sha256 "03c4ca001f72a1623393c0ec9406dfd82b7e449d745762a6e761da6a95d0fbd9" => :mavericks
-  end
-
   head do
     url "https://github.com/tmux/tmux.git"

@@ -45,8 +37,8 @@ class Tmux < Formula

     ENV.append "LDFLAGS", "-lresolv"
     system "./configure", "--disable-dependency-tracking",
-                          "--prefix=#{prefix}",
-                          "--sysconfdir=#{etc}"
+    "--prefix=#{prefix}",
+    "--sysconfdir=#{etc}"

     system "make", "install"

@@ -67,4 +59,11 @@ class Tmux < Formula
   test do
     system "#{bin}/tmux", "-V"
   end
+
+  def patches
+    [
+      "https://gist.githubusercontent.com/waltarix/1399751/raw/8c5f0018c901f151d39680ef85de6d22649b687a/tmux-ambiguous-width-cjk.patch",
+      "https://gist.githubusercontent.com/waltarix/1399751/raw/dc11f40266d9371e730eff41c64a70c84d34484a/tmux-pane-border-ascii.patch"
+    ]
+  end
 end

file3.txt

$ mkdir -p ~/project/homebrew-formula
$ cd !$
$ cp /path/to/homebrew-core/Formula/tmux.rb tmux21.rb
$ git init . && git add . && git commit -m 'add: tmux 2.1 formula'

file4.diff

diff --git a/tmux21.rb b/tmux21.rb
index 9922c5c..3b0d4b7 100644
--- a/tmux21.rb
+++ b/tmux21.rb
@@ -1,4 +1,4 @@
-class Tmux < Formula
+class Tmux21 < Formula
   desc "Terminal multiplexer"
   homepage "https://tmux.github.io/"

@@ -21,14 +21,6 @@ class Tmux < Formula
     end
   end

-  bottle do
-    cellar :any
-    revision 2
-    sha256 "815920cd38a8102360f7d667271d9c724f41087dd79be433db29259390ef8011" => :el_capitan
-    sha256 "93e2156c3c7e1c9f3f4b86dd84617e7519e9bee630f1e8769e00a91aa341d274" => :yosemite
-    sha256 "03c4ca001f72a1623393c0ec9406dfd82b7e449d745762a6e761da6a95d0fbd9" => :mavericks
-  end
-
   head do
     url "https://github.com/tmux/tmux.git"

@@ -45,8 +37,8 @@ class Tmux < Formula

     ENV.append "LDFLAGS", "-lresolv"
     system "./configure", "--disable-dependency-tracking",
-                          "--prefix=#{prefix}",
-                          "--sysconfdir=#{etc}"
+    "--prefix=#{prefix}",
+    "--sysconfdir=#{etc}"

     system "make", "install"

@@ -67,4 +59,11 @@ class Tmux < Formula
   test do
     system "#{bin}/tmux", "-V"
   end
+
+  def patches
+    [
+      "https://gist.githubusercontent.com/waltarix/1399751/raw/8c5f0018c901f151d39680ef85de6d22649b687a/tmux-ambiguous-width-cjk.patch",
+      "https://gist.githubusercontent.com/waltarix/1399751/raw/dc11f40266d9371e730eff41c64a70c84d34484a/tmux-pane-border-ascii.patch"
+    ]
+  end
 end

file4.txt

$ brew tap <Your-GitHub-Name>/<Your-Formula-Repository>
$ brew install tmux21

file5.txt

$ brew tap <Your-GitHub-Name>/<Your-Formula-Repository>
$ brew install tmux21