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[Xen-devel] [PATCH for-4.12] README: Document python2 dependency



Much of the tools and configure makefile actually have a python2
dependency; specify this.  It also assumes that `python` points to `python2`;
document how to work around this on systems where this is false.

Also update second version requirement listed to match the first.

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
Release justification:
 - Fixes a 'bug' in the documentation
 - No functional change

CC: Ian Jackson <ian.jackson@xxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
CC: Konrad Wilk <konrad.wilk@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien.grall@xxxxxxx>
CC: Juergen Gross <jgross@xxxxxxxx>
---
 README | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/README b/README
index 7807e93639..c19409efa2 100644
--- a/README
+++ b/README
@@ -46,7 +46,7 @@ provided by your OS distributor:
         - GCC 4.8 or later
         - GNU Binutils 2.24 or later
     * Development install of zlib (e.g., zlib-dev)
-    * Development install of Python v2.4 or later (e.g., python-dev)
+    * Development install of Python 2, v2.4 or later (e.g., python-dev)
     * Development install of curses (e.g., libncurses-dev)
     * Development install of openssl (e.g., openssl-dev)
     * Development install of x11 (e.g. xorg-x11-dev)
@@ -177,10 +177,16 @@ Python Runtime Libraries
 
 Various tools, such as pygrub, have the following runtime dependencies:
 
-    * Python 2.3 or later.
+    * Python 2, v2.4 or later.
           URL:    http://www.python.org/
           Debian: python
 
+Note that the build system expects `python` to be python2.  If your system
+has `python` pointing to python3 (as in the case of Arch Linux or Anaconda),
+you'll need to specify a path to a python2 binary when running configure:
+
+    PYTHON=/usr/bin/python2 ./configure
+
 Intel(R) Trusted Execution Technology Support
 =============================================
 
-- 
2.20.1


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