Index: README
===================================================================
diff -u -rdb01d0a802f64ab5cc3525416d9fd30011c16e21 -r5c2e3f4809a27afd59d3ad7d4a806cb8aa7d7a93
--- README	(.../README)	(revision db01d0a802f64ab5cc3525416d9fd30011c16e21)
+++ README	(.../README)	(revision 5c2e3f4809a27afd59d3ad7d4a806cb8aa7d7a93)
@@ -4,7 +4,7 @@
 
 Compilation of Source Distribution:
 
-On Unix-like environments (including Mac OS X), do
+On Unix-like environments (including macOS), do
 
    ./configure
    make
Index: dtrace/README
===================================================================
diff -u -rbf3b2a85554c5949fbce591998428f4bfbbecf32 -r5c2e3f4809a27afd59d3ad7d4a806cb8aa7d7a93
--- dtrace/README	(.../README)	(revision bf3b2a85554c5949fbce591998428f4bfbbecf32)
+++ dtrace/README	(.../README)	(revision 5c2e3f4809a27afd59d3ad7d4a806cb8aa7d7a93)
@@ -6,11 +6,11 @@
 with --with-dtrace also in cases where Tcl was compiled without it.
 
 To enable DTrace, run configure with the flag --with-dtrace configure
-flag. The DTrace support for NSF was developed under Mac OS X, other
+flag. The DTrace support for NSF was developed under macOS, other
 platforms might require some fine tuning to get it running. Please
 report improvements back to the NSF developers.
 
-In Mac OS X version including System Integrity Protection (SIP), one
+In macOS version including System Integrity Protection (SIP), one
 must deactivate SIP for DTrace, first:
 
 1) Boot into Recovery OS
Index: generic/asm/README
===================================================================
diff -u -rf5d6cc8d42ce2199f8185f6b3617f82be805a76b -r5c2e3f4809a27afd59d3ad7d4a806cb8aa7d7a93
--- generic/asm/README	(.../README)	(revision f5d6cc8d42ce2199f8185f6b3617f82be805a76b)
+++ generic/asm/README	(.../README)	(revision 5c2e3f4809a27afd59d3ad7d4a806cb8aa7d7a93)
@@ -161,7 +161,7 @@
 with integers (in case the typing information is available or
 inferable from the Tcl source). 
 
-The timing results based on clang under Mac OS X:
+The timing results based on clang under macOS:
 
 Call Threading:
 asm/t.001:	6.64
Index: library/mongodb/README
===================================================================
diff -u -r75f11a9a1c2b7370a3aa39c9b7fc1b98c5da7812 -r5c2e3f4809a27afd59d3ad7d4a806cb8aa7d7a93
--- library/mongodb/README	(.../README)	(revision 75f11a9a1c2b7370a3aa39c9b7fc1b98c5da7812)
+++ library/mongodb/README	(.../README)	(revision 5c2e3f4809a27afd59d3ad7d4a806cb8aa7d7a93)
@@ -49,7 +49,7 @@
   If configure complains about not finding bson, you might have to do
       export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
 
-  Note: Version 1.5.1 of the c-driver leads on Mac OS X to a crash on
+  Note: Version 1.5.1 of the c-driver leads on macOS to a crash on
   exit, when configured SASL support (from mac ports) and the flag
   "--disable-automatic-init-and-cleanup" is missing.