-> USING CUPS REQUIRES ADDITIONAL THIRD-PARTY SUPPORT SOFTWARE AND PRINTER
-> DRIVERS. THESE ARE TYPICALLY INCLUDED WITH YOUR OPERATING SYSTEM
-> DISTRIBUTION. APPLE DOES NOT ENDORSE OR SUPPORT THIRD-PARTY SUPPORT SOFTWARE
-> FOR CUPS.
+Using CUPS requires additional third-party support software and printer drivers.
+These are typically included with your operating system distribution. Apple
+does not endorse or support third-party support software for CUPS.
+
+> Note: Current versions of macOS DO NOT allow installation to /usr with the
+> default System Integrity Protection (SIP) settings. In addition, we do not
+> recommend replacing the CUPS supplied with macOS because:
+>
+> a. not all versions of CUPS are compatible with every macOS release,
+>
+> b. code signing prevents replacement of system libraries and access to the
+> system keychain (needed for encrypted printer sharing), and
+>
+> c. software updates will often replace parts of your local installation,
+> potentially rendering your system unusable.
+>
+> Apple only supports using the Clang supplied with Xcode to build CUPS on
+> macOS.