Document new COMPILED_BY environment variable

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@4567 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 9 insertions, 2 deletions

diff --git a/doc/INSTALL b/doc/INSTALL
index c20d372e..2c6403ff 100644
--- a/doc/INSTALL
+++ b/doc/INSTALL
@@ -109,8 +109,8 @@ If you use the 'configure' program, be sure to edit config.mk _after_ you
 run 'configure', since 'configure' generates config.mk.
 
 
-COMPILED-IN BUILD DATETIME
---------------------------
+COMPILED-IN BUILD DATETIME AND USER
+-----------------------------------
 
 By default, the Netpbm build system builds the datetime that you built it
 into libnetpbm, so the --version global command line option can display it.
@@ -137,6 +137,13 @@ The name and meaning of the environment variable is taken from a standard
 described at https://reproducible-builds.org/specs/source-date-epoch/ on March
 16, 2017.
 
+Likewise, the Netpbm build system builds the identity of the party who did the
+build in libnetpbm.  This is normally a userid, the output of the 'whoami'
+program, unless overridden by USER or LOGNAME environment variables.  You can
+also override 'whoami', USER, and LOGNAME with the COMPILED_BY environment
+variable.  This value is just for display, so it need not be a userid; any
+single word that does not contain quotation marks is acceptable.
+
 
 AUTOMATING THE BUILD
 --------------------