diff --git a/FindLibKrb5.cmake b/FindLibKrb5.cmake
index 925a78a..cf01feb 100644
--- a/FindLibKrb5.cmake
+++ b/FindLibKrb5.cmake
@@ -18,13 +18,24 @@
 #  LibKrb5_INCLUDE_DIR             The location of Krb5 headers
 
 if (NOT LibKrb5_ROOT_DIR)
-    find_path(LibKrb5_ROOT_DIR NAMES include/krb5.h)
+    find_path(LibKrb5_ROOT_DIR NAMES include/krb5/krb5.h)
 endif ()
 
 find_library(LibKrb5_LIBRARY NAMES krb5 HINTS ${LibKrb5_ROOT_DIR}/lib)
 
 find_path(LibKrb5_INCLUDE_DIR NAMES krb5/krb5.h HINTS ${LibKrb5_ROOT_DIR}/include)
 
+# If using macOS, make sure that we're not finding the system's libkrb5. It
+# an old version, which points you at GSS.framework, which is also deprecated.
+if (LibKrb5_LIBRARY AND "${CMAKE_SYSTEM_NAME}" MATCHES "Darwin")
+    if ("${LibKrb5_LIBRARY}" MATCHES "^/Library/Developer/CommandLineTools/SDKs/.*")
+        message(
+            FATAL_ERROR
+                "Found macOS system version of libkrb5 at ${LibKrb5_LIBRARY}. Please use the version from Homebrew instead, which is known to be more stable."
+        )
+    endif ()
+endif ()
+
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(LibKrb5 DEFAULT_MSG LibKrb5_LIBRARY LibKrb5_INCLUDE_DIR)