[gtranslator/40-check-for-gtk-doc-installed] Check for gtk-doc dep only if gtk_doc is enabled

[Daniel Garcia Moreno <danigm src gnome org>]

commit 584295e85af456664762b27d19cbc732aae6aca6
Author: Daniel García Moreno <danigm wadobo com>
Date:   Mon Nov 26 09:55:16 2018 +0100

    Check for gtk-doc dep only if gtk_doc is enabled

 meson.build | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index c026076e..d52d8702 100644
--- a/meson.build
+++ b/meson.build
@@ -103,7 +103,6 @@ src_dir = join_paths(meson.source_root(), 'src')
 
 glib_dep = dependency('glib-2.0', version: '>= 2.36.0')
 gtk_dep = dependency('gtk+-3.0', version: '>= 3.22.20')
-gtk_doc_dep = dependency('gtk-doc-tools', version: '>= 1.28')
 
 iso_codes_dep = dependency('iso-codes', version: '>= 0.35')
 config_h.set_quoted('PACKAGE_ISO_CODES_PREFIX', iso_codes_dep.get_pkgconfig_variable('prefix'))
@@ -112,7 +111,6 @@ gtr_deps = [
   glib_dep,
   gtk_dep,
   iso_codes_dep,
-  gtk_doc_dep,
   dependency('libgda-5.0'),
   dependency('gio-2.0', version: '>= 2.36.0'),
   dependency('gsettings-desktop-schemas'),
@@ -141,8 +139,11 @@ subdir('po')
 subdir('help')
 subdir('man')
 
+
 enable_gtk_doc = get_option('gtk_doc')
 if enable_gtk_doc
+  gtk_doc_dep = dependency('gtk-doc', version: '>= 1.28')
+  gtr_deps += gtk_doc_dep
   subdir('doc/reference')
 endif