Drop dependency on m4

m4 was hugely popular in the past, because autotools, automake, flex, bison and
many other things used it. But nowadays it much less popular, and might not even
be installed in the buildroot. (m4 is small, so it doesn't make a big difference.)

(FWIW, Fedora dropped make from the buildroot now,
https://fedoraproject.org/wiki/Changes/Remove_make_from_BuildRoot. I think it's
reasonable to assume that m4 will be dropped at some point too.)

The main reason to drop m4 is that the syntax is not very nice, and we should
minimize the number of different syntaxes that we use. We still have two
(configure_file() with @FOO@ and jinja2 templates with {{foo}} and the
pythonesque conditional expressions), but at least we don't need m4 (with
m4_dnl and `quotes').

1 files changed, 1 insertions, 1 deletions

diff --git a/README b/README
index 88057d2d95..a2b19d656d 100644
--- a/README
+++ b/README
@@ -195,7 +195,7 @@ REQUIREMENTS:
         python >= 3.5
         meson >= 0.46 (>= 0.49 is required to build position-independent executables)
         ninja
-        gcc, awk, sed, grep, m4, and similar tools
+        gcc, awk, sed, grep, and similar tools
         clang >= 10.0, llvm >= 10.0 (optional, required to build BPF programs
                 from source code in C)