[devhelp] build: check for gsettings-desktop-schemas with pkg-config

[Sébastien Wilmet <swilmet src gnome org>]

commit 7bb3bdb7208556087ded1e3f59ff206ca1e63eee
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Apr 28 18:08:03 2017 +0200

    build: check for gsettings-desktop-schemas with pkg-config
    
    DhSettings uses gsettings-desktop-schemas for the fonts.

 README       |   10 +++++-----
 configure.ac |    1 +
 2 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/README b/README
index 1ae1cee..513ec74 100644
--- a/README
+++ b/README
@@ -5,11 +5,11 @@ The Devhelp web page:
 
   https://wiki.gnome.org/Apps/Devhelp
 
-The following packages are required to compile Devhelp:
-
-glib >= 2.38
-gtk+ >= 3.20
-webkit2gtk-4.0 >= 2.6
+Dependencies:
+- glib >= 2.38
+- gtk+ >= 3.20
+- webkit2gtk-4.0 >= 2.6
+- gsettings-desktop-schemas
 
 Devhelp's primary goal is to be an API documentation browser for
 GNOME. When you build (or install) a GNOME library, it will build an
diff --git a/configure.ac b/configure.ac
index af905be..0f003d8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,6 +60,7 @@ PKG_CHECK_MODULES(DEVHELP, [
   gio-2.0 >= 2.38
   gtk+-3.0 >= 3.20
   webkit2gtk-4.0 >= 2.6
+  gsettings-desktop-schemas
 ])
 
 AC_ARG_WITH(zlib, [  --with-zlib=DIR         use zlib in DIR], zlibdir=$with_zlib)