19535: Add --enable-cap

1 files changed, 18 insertions, 6 deletions

diff --git a/INSTALL b/INSTALL
index 75d675d2e..8798294d4 100644
--- a/INSTALL
+++ b/INSTALL
@@ -359,20 +359,32 @@ correct handling of these types.
 None of this is relevant for 64-bit systems; zsh should compile and run
 without problems if (sizeof(long) == 8).
 
-Searching for `pcre'
---------------------
+Searching for additional features
+---------------------------------
+
+Various additional features are turned off by default to avoid
+compatibility problems.
+
+--enable-pcre:
 
 Zsh has a module which allows the pcre regular expression library to be
 used via shell builtins.  Compiling this library into the shell with
 dynamic loading (the default where available) produces a dependency on the
 library libpcre.so.  This is a problem on systems where zsh needs to be
-available at boot before the directory containing libpcre.so (for
-example /usr/lib or /usr/local/lib) is mounted.  For this reason,
-pcre support will only be searched for if the option --enable-pcre
-is passed to configure.
+available at boot before the directory containing libpcre.so (for example
+/usr/lib or /usr/local/lib) is mounted.  For this reason, pcre support will
+only be searched for if the option --enable-pcre is passed to configure.
 
 (Future versions of the shell may have a better fix for this problem.)
 
+--enable-cap:
+
+This searches for POSIX capabilities; if found, the `cap' library
+is available and the shell will use these to determine if the
+shell is running in some privileged mode.  This is turned off by
+default as on some systems non-standard headers (in particular AIX) are
+required.  A direct fix for that problem would be appreciated.
+
 Options For Configure
 ---------------------