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-rw-r--r--INSTALL20
1 files changed, 20 insertions, 0 deletions
diff --git a/INSTALL b/INSTALL
index f4b09e06a..00791cd86 100644
--- a/INSTALL
+++ b/INSTALL
@@ -13,6 +13,26 @@ instructions in the first.
 MAKING AND INSTALLING
 =====================
 
+Dependencies
+------------
+
+The main shell can be compiled with tools available on a typical
+Unix-like system including development packages.  However, the
+documentation requires various additional tools that are not so standard:
+
+- YODL, for turning the documentation source files (.yo) into manual
+pages and TeXinfo source for producing PDF and .info formats;
+
+- Perl and interactive manual tools, for turning the zshbuiltins(1)
+manual into help files that can be displayed by the run-help function.
+For example, the colcrt or col tool, not typically required for
+installing software, must be available.
+
+To avoid needing these, the source distribution is supplemented by a
+documentation distribution that may be downloaded from the same place as
+the source.  This provides fully generated documentation with references
+to files in the default locations.
+
 Check MACHINES File
 -------------------