patch foment to respect new envar R7RS_LIBRARY_PATH

1 files changed, 7 insertions, 2 deletions

diff --git a/README.md b/README.md
index c1c85e2..ce4d9d7 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,12 @@
 Run Scheme implementations in Guix containers/environments, and package
 libraries for them.
 
-TODO: portable r7rs and r6rs install location. Use a dummy library and
-patches.
+## Portable R6RS and R7RS Libraries
+
+Some Scheme systems packaged here will read `R7RS_LIBRARY_PATH`
+(or `R6RS_LIBRARY_PATH` for R6RS systems) to find paths for strictly
+conforming R7RS (R6RS) libraries. To copy libraries to these pathes,
+use the `portable-r7rs-build-system` (`portable-r6rs-build-system`).
 
 ## Chibi Scheme
 
@@ -17,6 +21,7 @@ patches.
 * Library: `(mcgoron guix foment)`
 * Package: `foment`
 * Pure Scheme: `foment-build-system`
+* Supports `portable-r7rs-build-system`
 
 The build script here will build [Foment](https://github.com/leftmike/foment).
 The last release of Foment was a long time ago, so the build is for the