[glib: 2/10] docs: Mention how to install a new Meson version using pip in INSTALL.in

[Philip Withnall <pwithnall src gnome org>]

commit 91c50c292755f8360d2f786168cadde4f20446c5
Author: Philip Withnall <pwithnall endlessos org>
Date:   Thu May 5 19:08:41 2022 +0100

    docs: Mention how to install a new Meson version using pip in INSTALL.in
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 INSTALL.in | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/INSTALL.in b/INSTALL.in
index c5b551cba8..c1463cd041 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -24,7 +24,9 @@ information.) Information about pkg-config can be found at:
 
   http://www.freedesktop.org/software/pkgconfig/
 
-Meson (http://mesonbuild.com/) is also required.
+Meson (http://mesonbuild.com/) is also required. If your distribution does not
+package a new enough version of Meson, it can be [installed using
+`pip`](https://mesonbuild.com/Getting-meson.html#installing-meson-with-pip).
 
 In order to implement conversions between character sets,
 GLib requires an implementation of the standard iconv() routine.