README: explain dependency on cgroups

[elogind.git] / README

diff --git a/README b/README
index b7b0db763e0db7ddba1557dd0b3c3057d1c2f9af..a4cbeaebd33174065aa31bea59d284e5996e23d9 100644 (file)
--- a/README
+++ b/README
@@ -30,7 +30,10 @@ LICENSE:
         GPLv2+ for all code, except sd-daemon.[ch] which is MIT
 
 REQUIREMENTS:
-        Linux kernel >= 2.6.30 (with devtmpfs, cgroups; optional but strongly recommended: autofs4, ipv6)
+        Linux kernel >= 2.6.39
+                with devtmpfs
+                with cgroups (but it's OK to disable all controllers)
+                optional but strongly recommended: autofs4, ipv6
         libudev >= 172
         dbus >= 1.4.0
         libcap
@@ -50,6 +53,7 @@ REQUIREMENTS:
         automake
         autoconf
         libtool
+        gperf
         make, gcc, and similar tools
 
         During runtime you need the following dependencies:
@@ -67,6 +71,11 @@ REQUIREMENTS:
         add a dependency on nss-myhostname to the package that
         includes systemd-hostnamed.
 
+        Note that D-Bus can link against libsystemd-login.so, which
+        results in a cyclic build dependency. To accomodate for this
+        please build D-Bus without systemd first, then build systemd,
+        then rebuild D-Bus with systemd support.
+
 WARNINGS:
         systemd will warn you during boot if /etc/mtab is not a
         symlink to /proc/mounts. Please ensure that /etc/mtab is a