Avoid meson 0.54.0
Meson 0.54.0 requires Ninja 1.7, as documented at
https://mesonbuild.com/Release-notes-for-0-54-0.html. Ubuntu 16.04 only
ships with ninja 1.5.1 by default (a backport is available). We have no
need for newer ninja/meson versions at the moment, so let's avoid
requiring all Ubuntu 16.04 users to add/enable a separate repository and
stick to older versions of meson.
Fixes #1840
Signed-off-by: Philipp Wagner <phw@lowrisc.org>
diff --git a/python-requirements.txt b/python-requirements.txt
index d7ec6e5..8d3bc1f 100644
--- a/python-requirements.txt
+++ b/python-requirements.txt
@@ -10,8 +10,9 @@
mako
# Meson 0.53.0 broke compatibility with Python 3.5.2, see
# https://github.com/lowRISC/opentitan/issues/1288 for details.
-# Newer versions are fine.
-meson >= 0.51.0, != 0.53.0 # minimum matches version in meson.build
+# Meson 0.54.0+ requires ninja 1.7+, which isn't available by default on
+# Ubuntu 16.04.
+meson >= 0.51.0, != 0.53.0, <0.54.0 # minimum matches version in meson.build
mistletoe>=0.7.2
pyftdi
pygments
