[dasher: 35/61] Document --enable-speech=yes for speech support when running autogen.sh

[Patrick Welche <pwelche src gnome org>]

commit 262012fd902f11ba9f8f5d3add9dfa6c742d0ee7
Author: Earth <Earth@BlueSky>
Date:   Tue Nov 22 21:11:59 2016 +0300

    Document --enable-speech=yes for speech support when running autogen.sh

 INSTALL.Linux |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/INSTALL.Linux b/INSTALL.Linux
index 9cdcb57..73a8100 100644
--- a/INSTALL.Linux
+++ b/INSTALL.Linux
@@ -27,6 +27,10 @@ Then autogen:
 
   ./autogen.sh
 
+If the speech support is desired then
+
+  ./autogen.sh --enable-speech=yes
+
 After this, follow "Basic Installation" section in the "INSTALL" file.
 For the "configure" step, the following configure-time options are
 also available (see also the section "`configure' Invocation" in