diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 4cff28d8e4da9..4b3ef33f27939 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1266,7 +1266,7 @@ def inspect
   # Note: there isn't a std_autotools variant because autotools is a lot
   # less consistent and the standard parameters are more memorable.
   def std_cmake_args
-    %W[
+    args = %W[
       -DCMAKE_C_FLAGS_RELEASE=-DNDEBUG
       -DCMAKE_CXX_FLAGS_RELEASE=-DNDEBUG
       -DCMAKE_INSTALL_PREFIX=#{prefix}
@@ -1275,6 +1275,14 @@ def std_cmake_args
       -DCMAKE_VERBOSE_MAKEFILE=ON
       -Wno-dev
     ]
+
+    # Avoid false positives for clock_gettime support on 10.11.
+    # CMake cache entries for other weak symbols may be added here as needed.
+    if MacOS.version == "10.11" && MacOS::Xcode.installed? && MacOS::Xcode.version >= "8.0"
+      args << "-DHAVE_CLOCK_GETTIME:INTERNAL=0"
+    end
+
+    args
   end
 
   # an array of all core {Formula} names