update readme and add news item

shikokuchuo · Jan 31, 2025 · bbcacbf · bbcacbf
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diff --git a/NEWS.md b/NEWS.md
@@ -1,5 +1,9 @@
 # nanonext 1.5.0.9000 (development)
 
+#### Updates
+
+* Unified Windows build system now attempts to compile 'libmbedtls' and 'libnng' from source even on R <= 4.1 using Rtools40 or earlier.
+
 # nanonext 1.5.0
 
 #### Library Updates

diff --git a/README.Rmd b/README.Rmd
@@ -156,9 +156,9 @@ As system libraries, 'libnng' is available as libnng-dev (deb) or nng-devel (rpm
 
 #### Windows
 
-For R >= 4.2 using the 'Rtools42' or newer toolchains, 'libnng' v1.10.1 and 'libmbedtls' v3.6.2 will be automatically compiled from the package sources during installation.
+On Windows, 'libnng' v1.10.1 and 'libmbedtls' v3.6.2 will be compiled from the package sources during installation and hence requires the 'Rtools' toolchain.
 
-For previous R versions, pre-compiled 'libnng' v1.10.1 and 'libmbedtls' v3.6.2 libraries are downloaded and used for installation instead.
+For R >= 4.2 using the 'Rtools42' or newer toolchains, the prerequisite 'cmake' is included. For previous R versions using 'Rtools40' or earlier, it may be necessary to separately install a version of 'cmake' in Windows and ensure that it is added to your system's `PATH`.
 
 ### Acknowledgements and Links
 

diff --git a/README.md b/README.md
@@ -201,12 +201,14 @@ OpenCSW - refer to the ‘cmake’ website for the latest source file.*
 
 #### Windows
 
-For R \>= 4.2 using the ‘Rtools42’ or newer toolchains, ‘libnng’ v1.10.1
-and ‘libmbedtls’ v3.6.2 will be automatically compiled from the package
-sources during installation.
-
-For previous R versions, pre-compiled ‘libnng’ v1.10.1 and ‘libmbedtls’
-v3.6.2 libraries are downloaded and used for installation instead.
+On Windows, ‘libnng’ v1.10.1 and ‘libmbedtls’ v3.6.2 will be compiled
+from the package sources during installation and hence requires the
+‘Rtools’ toolchain.
+
+For R \>= 4.2 using the ‘Rtools42’ or newer toolchains, the prerequisite
+‘cmake’ is included. For previous R versions using ‘Rtools40’ or
+earlier, it may be necessary to separately install a version of ‘cmake’
+in Windows and ensure that it is added to your system’s `PATH`.
 
 ### Acknowledgements and Links