diff --git a/Formula/weechat.rb b/Formula/weechat.rb
index 24ff250247..2e7aa159ea 100644
--- a/Formula/weechat.rb
+++ b/Formula/weechat.rb
@@ -3,6 +3,7 @@ class Weechat < Formula
   homepage "https://www.weechat.org"
   url "https://weechat.org/files/src/weechat-2.6.tar.xz"
   sha256 "fa9e3130e7afdfb6eff1b7892caac3efdd38a442f9989ca8c061eced2c755148"
+  revision 1
   head "https://github.com/weechat/weechat.git"
 
   bottle do
@@ -38,6 +39,10 @@ class Weechat < Formula
       args << "-DRUBY_LIB=/usr/lib/libruby.dylib"
     end
 
+    if MacOS.version >= :mojave && MacOS::CLT.installed?
+      ENV["SDKROOT"] = ENV["HOMEBREW_SDKROOT"] = MacOS::CLT.sdk_path(MacOS.version)
+    end
+
     mkdir "build" do
       system "cmake", "..", *args
       system "make", "install", "VERBOSE=1"