[libsigc++2] Docs: Use doxygen-extra.css

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 937a0811cbed09c4c893cf57b41c8b6b59307558
Author: Kjell Ahlstedt <kjell ahlstedt bredband net>
Date:   Mon Sep 15 15:28:25 2014 +0200

    Docs: Use doxygen-extra.css
    
    * configure.ac: Require mm-common 0.9.7.
    * docs/.gitignore: Ignore doxygen-extra.css.
    * docs/reference/Doxyfile.in: Use doxygen-extra.css instead of doxygen.css.

 configure.ac               |    2 +-
 docs/.gitignore            |    1 +
 docs/reference/Doxyfile.in |    4 ++--
 3 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 1936c0c..f086b69 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,7 +30,7 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
 AM_MAINTAINER_MODE
 AC_ARG_VAR([ACLOCAL_FLAGS], [aclocal flags, e.g. -I <macro dir>])
 
-MM_PREREQ([0.9.6])
+MM_PREREQ([0.9.7])
 MM_INIT_MODULE([sigc++-2.0])
 MM_CONFIG_DOCTOOL_DIR([docs])
 
diff --git a/docs/.gitignore b/docs/.gitignore
index 8b8538c..deefdf5 100644
--- a/docs/.gitignore
+++ b/docs/.gitignore
@@ -1,6 +1,7 @@
 /doc-install.pl
 /doc-postprocess.pl
 /doxygen.css
+/doxygen-extra.css
 /tagfile-to-devhelp2.xsl
 /manual/html/
 /reference/html/
diff --git a/docs/reference/Doxyfile.in b/docs/reference/Doxyfile.in
index b9d0daa..3e0f954 100644
--- a/docs/reference/Doxyfile.in
+++ b/docs/reference/Doxyfile.in
@@ -915,7 +915,7 @@ HTML_FOOTER            =
 # HTML_EXTRA_STYLESHEET instead of this one, as it is more robust and this
 # tag will in the future become obsolete.
 
-HTML_STYLESHEET        = "@abs_top_srcdir@/docs/doxygen.css"
+HTML_STYLESHEET        =
 
 # The HTML_EXTRA_STYLESHEET tag can be used to specify an additional
 # user-defined cascading style sheet that is included after the standard
@@ -925,7 +925,7 @@ HTML_STYLESHEET        = "@abs_top_srcdir@/docs/doxygen.css"
 # robust against future updates. Doxygen will copy the style sheet file to
 # the output directory.
 
-HTML_EXTRA_STYLESHEET  =
+HTML_EXTRA_STYLESHEET  = "$(MMDOCTOOLDIR)/doxygen-extra.css"
 
 # The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
 # other source files which should be copied to the HTML output directory. Note