X-Git-Url: https://git.hcoop.net/bpt/guile.git/blobdiff_plain/2db1dbfe275986c4762d247209a02417818f62f8..HEAD:/README

diff --git a/README b/README
index 66f02b362..92d786c06 100644
--- a/README
+++ b/README
@@ -62,7 +62,7 @@ Required External Packages ================================================
 
 Guile requires the following external packages:
 
-  - GNU MP, at least version 4.1
+  - GNU MP, at least version 4.2
 
     GNU MP is used for bignum arithmetic.  It is available from
     http://gmplib.org/ .
@@ -72,7 +72,7 @@ Guile requires the following external packages:
     libltdl is used for loading extensions at run-time.  It is
     available from http://www.gnu.org/software/libtool/ .
 
-  - GNU libunistring
+  - GNU libunistring, at least version 0.9.3
 
     libunistring is used for Unicode string operations, such as the
     `utf*->string' procedures.  It is available from
@@ -82,7 +82,7 @@ Guile requires the following external packages:
 
     libgc (aka. the Boehm-Demers-Weiser garbage collector) is the
     conservative garbage collector used by Guile.  It is available
-    from http://www.hpl.hp.com/personal/Hans_Boehm/gc/ .
+    from http://www.hboehm.info/gc/ .
 
   - libffi
 
@@ -93,10 +93,15 @@ Guile requires the following external packages:
   - pkg-config
 
     Guile's ./configure script uses pkg-config to discover the correct
-    compile and link options for libgc and libffi.  If you don't have
-    pkg-config installed, or you have a version of libgc that doesn't
-    provide a .pc file, you can work around this by setting some
-    variables as part of the configure command-line:
+    compile and link options for libgc and libffi.  For this to work,
+    the `PKG_CONFIG_PATH' environment variable must be set to point to
+    the places where libgc's and libffi's `.pc' files can be found:
+
+      PKG_CONFIG_PATH=/path/to/libgc/lib/pkgconfig:/path/to/libffi/lib/pkgconfig
+
+    Alternatively, when pkg-config is not installed, you can work around
+    this by setting some variables as part of the configure
+    command-line:
 
     - PKG_CONFIG=true