[balsa] Bump required versions of GLib and Gtk3

[Peter Bloomfield <peterb src gnome org>]

commit 02cca7fd4b4b2c6a94229ce3f9ed80ed104df55a
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Mon May 13 22:00:01 2019 -0400

    Bump required versions of GLib and Gtk3
    
    Bump required version of GLib to 2.48, and Gtk3 to 3.18
    
    * configure.ac:
    * meson.build:

 ChangeLog    | 7 +++++++
 configure.ac | 6 +++---
 meson.build  | 4 ++--
 3 files changed, 12 insertions(+), 5 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 67f042dbb..c9a4b5d13 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2019-05-13  Peter Bloomfield  <pbloomfield bellsouth net>
+
+       Bump required version of GLib to 2.48, and Gtk3 to 3.18
+
+       * configure.ac:
+       * meson.build:
+
 2019-05-12  Albrecht Dreß  <albrecht dress arcor de>
 
        Fix “Johnny you are fired” vulnerabilities
diff --git a/configure.ac b/configure.ac
index b8446706d..ccd4730ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -228,8 +228,8 @@ dnl 4. Libraries.
 dnl #####################################################################
 
 PKG_CHECK_MODULES(BALSA, [
-glib-2.0 >= 2.40.0
-gtk+-3.0 >= 3.10.0
+glib-2.0 >= 2.48.0
+gtk+-3.0 >= 3.18.0
 gmime-2.6
 gio-2.0
 gthread-2.0
@@ -247,7 +247,7 @@ PKG_CHECK_MODULES(LIBNETCLIENT, [
        glib-2.0
        gio-2.0
        gnutls
-])     
+])
 
 AC_MSG_CHECKING(whether res_init is available)
 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <resolv.h>;]],
diff --git a/meson.build b/meson.build
index 514256f5d..82aafc1c1 100644
--- a/meson.build
+++ b/meson.build
@@ -128,8 +128,8 @@ conf.set('TOOLKIT_CATEGORIES', TOOLKIT_CATEGORIES)
 # #####################################################################
 
 # Dependencies for balsa and balsa_ab:
-glib_dep    = dependency('glib-2.0', version : '>= 2.40.0')
-gtk_dep     = dependency('gtk+-3.0', version : '>= 3.10.0')
+glib_dep    = dependency('glib-2.0', version : '>= 2.48.0')
+gtk_dep     = dependency('gtk+-3.0', version : '>= 3.18.0')
 gmime_dep   = dependency('gmime-2.6')
 gio_dep     = dependency('gio-2.0')
 gthread_dep = dependency('gthread-2.0')