Better --enable-zlib description

diff --git a/INSTALL b/INSTALL
index 3d982b26914a96f43879abddd79235c8822c4727..69dc236df3c3c70ad1ec37675bf0f683c0a8f538 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -604,11 +604,15 @@ The following options are also configurable at runtime:
        if the executable is simply not in the user's path, sudo will tell
        the user that they are not allowed to run it, which can be confusing.
 
-  --enable-zlib[=DIR]
-        Enable the use of the zlib compress library when storing
-        I/O log files.  If specified, DIR is the base directory
-        containing the zlib include and lib directories.  By default
-        zlib is used if it is found on the system.
+  --enable-zlib[=location]
+       Enable the use of the zlib compress library when storing
+       I/O log files.  If specified, location is the base directory
+       containing the zlib include and lib directories.  The special
+       values "system" and "builtin" can be used to indicate that
+       the system version of zlib should be used or that the version
+       of zlib shipped with sudo should be used instead.
+       If this option is not specified, configure will use the
+       system zlib if it is present.
 
   --disable-zlib
         Disable the use of the zlib compress library when storing