[tracker/thunderbird] thunderbird: Use a proper version comparison function

[Martyn James Russell <mr src gnome org>]

commit 454af4a55006d9852b5513a0c4c108d4e514aaec
Author: Martyn Russell <martyn lanedo com>
Date:   Thu Jul 28 14:28:46 2011 +0100

    thunderbird: Use a proper version comparison function
    
    Right now, we fix the v5.0b3 version by truncating the string, but if we have
    a v5.1 then this also won't work. This does a proper comparison.

 configure.ac |   11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0ce38b6..f48c67f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -399,13 +399,12 @@ have_tracker_miner_thunderbird="no "
 
 AC_PATH_PROG(THUNDERBIRD, thunderbird, thunderbird)
 if test -n $THUNDERBIRD; then
-   thunderbird_version=`$THUNDERBIRD --version | cut -d" " -f3 | head -c3`
+   thunderbird_version=`$THUNDERBIRD --version | cut -d" " -f3`
 
-   # This is a crappy way to do it, we should improve this.
-   if test "$thunderbird_version" = "$TRACKER_MINER_THUNDERBIRD_REQUIRED" ; then
-      AC_SUBST(THUNDERBIRD)
-      have_tracker_miner_thunderbird=yes
-   fi
+   AX_COMPARE_VERSION([$thunderbird_version], ge, [$TRACKER_MINER_THUNDERBIRD_REQUIRED],
+                      have_tracker_miner_thunderbird="yes",
+                      have_tracker_miner_thunderbird="no ")
+   AC_SUBST(THUNDERBIRD)
 fi
 
 # Check requirements for tracker-miner-rss