[tracker/configurable-bus-type: 1/2] build: Add version for libicu in the build requirements

[Martyn James Russell <mr src gnome org>]

commit bbb4e8e8988069600d492c31da6a5588fd2df9ff
Author: Martyn Russell <martyn lanedo com>
Date:   Fri Mar 7 10:56:36 2014 +0000

    build: Add version for libicu in the build requirements
    
    The version we depend on is the first libicu version with pkg-config shipped,
    but it's important to put this in the build requirements so people know what
    they need.

 configure.ac |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index d2941be..5e0c545 100644
--- a/configure.ac
+++ b/configure.ac
@@ -177,6 +177,7 @@ MEEGOTOUCH_REQUIRED=0.20
 POPPLER_REQUIRED=0.16.0
 CAIRO_REQUIRED=1.0
 GDK_REQUIRED=1.0
+LIBICU_REQUIRED=52.1
 LIBJPEG_REQUIRED="any version"
 LIBGIF_REQUIRED="any version"
 LIBTIFF_REQUIRED="any version"
@@ -889,7 +890,7 @@ LIBUNISTRING_LIBS="-lunistring"
 
 # Check for libicu...
 PKG_CHECK_MODULES(LIBICU,
-                  [icu-i18n icu-uc],
+                  [icu-i18n >= $LIBICU_REQUIRED icu-uc >= $LIBICU_REQUIRED],
                   [have_libicu=yes],
                   [have_libicu=no])