[ghex/gtk4-port: 1/91] Start gtk4 port. Bump deps to gtk4 minimums.

[Logan Rathbone <larathbone src gnome org>]

commit fb0f4b1f0df9773ef46caa1715b5fbe98b6c1f41
Author: Logan Rathbone <poprocks gmail com>
Date:   Sat Jan 2 21:08:15 2021 -0500

    Start gtk4 port. Bump deps to gtk4 minimums.

 data/{gtkhex-3.pc.in => gtkhex-4.pc.in} | 6 +++---
 data/meson.build                        | 4 ++--
 meson.build                             | 8 +++++---
 3 files changed, 10 insertions(+), 8 deletions(-)
---
diff --git a/data/gtkhex-3.pc.in b/data/gtkhex-4.pc.in
similarity index 69%
rename from data/gtkhex-3.pc.in
rename to data/gtkhex-4.pc.in
index 44ccb511..569aea74 100644
--- a/data/gtkhex-3.pc.in
+++ b/data/gtkhex-4.pc.in
@@ -6,8 +6,8 @@ includedir=@includedir@
 Name: gtkhex
 Description: GtkHex - A hex display widget.
 Version: @VERSION@
-Requires: gtk+-3.0
+Requires: gtk4
 Requires.private: gail-3.0
-Libs: -L${libdir} -lgtkhex-3
-Cflags: -I${includedir}/gtkhex-3
+Libs: -L${libdir} -lgtkhex-4
+Cflags: -I${includedir}/gtkhex-4
 
diff --git a/data/meson.build b/data/meson.build
index 36447250..9135a87a 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -34,8 +34,8 @@ pkg_conf.set('includedir', ghex_includedir)
 pkg_conf.set('VERSION', meson.project_version())
 
 configure_file(
-  input: 'gtkhex-3.pc.in',
-  output: 'gtkhex-3.pc',
+  input: 'gtkhex-4.pc.in',
+  output: 'gtkhex-4.pc',
   configuration: pkg_conf,
   install_dir: ghex_pkgconfigdir,
   install: true
diff --git a/meson.build b/meson.build
index 03f657ad..1d86f0ad 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project(
   'ghex', 'c',
-  version: '3.18.4',
+  version: '4.alpha.0',
   meson_version: '>=0.37.0',
   license: 'GPL2'
 )
@@ -77,11 +77,13 @@ foreach f : check_functions
   endif
 endforeach
 
+# FIXME - REMOVE
 atk_dep = dependency('atk', version: '>= 1.0.0')
-gio_dep = dependency('gio-2.0', version: '>= 2.31.10')
-gtk_dep = dependency('gtk+-3.0', version: '>= 3.3.8')
 gail_dep = dependency('gail-3.0', version: '>= 1.0.0')
 
+gio_dep = dependency('gio-2.0', version: '>= 2.66.0')
+gtk_dep = dependency('gtk4', version: '>= 4.0.0')
+
 configure_file(
   output: 'config.h',
   configuration: ghex_conf