doc: mention m4 requirement when building from git in INSTALL

xdelaruelle · xdelaruelle · commit 9b8c0fe86767 · 2023-05-20T17:12:40.000+02:00
diff --git a/INSTALL.rst b/INSTALL.rst
@@ -46,6 +46,7 @@ are required:
 * autoconf
 * automake
 * autopoint
+* m4
 * python
 * sphinx >= 1.0
 * gzip
