[devhelp] build: Use more AX_REQUIRE_DEFINED

[Sébastien Wilmet <swilmet src gnome org>]

commit 348fb1b67f6e49439f41f5acd37d642b95a71f27
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Nov 10 16:56:00 2016 -0600

    build: Use more AX_REQUIRE_DEFINED
    
    Now that we depend on autoconf-archive, give some better error messages
    in the case autoconf-archive is available but other required macros are
    not.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774069

 configure.ac |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 44378a1..8a170ac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,7 @@ AC_PROG_CC
 LT_PREREQ([2.2])
 LT_INIT([disable-static])
 
+AX_REQUIRE_DEFINED([GLIB_GSETTINGS])
 GLIB_GSETTINGS
 
 GOBJECT_INTROSPECTION_CHECK([1.30.0])
@@ -49,6 +50,8 @@ AX_COMPILER_FLAGS
 AC_CHECK_LIBM
 AC_SUBST(LIBM)
 
+AX_REQUIRE_DEFINED([PKG_CHECK_MODULES])
+
 PKG_CHECK_MODULES(DEVHELP, [
   gio-2.0 >= 2.38
   gtk+-3.0 >= 3.20
@@ -84,6 +87,7 @@ AC_PATH_PROG(GLIB_MKENUMS, glib-mkenums)
 
 AM_PATH_PYTHON([2.3],[],[no])
 
+AX_REQUIRE_DEFINED([GTK_DOC_CHECK])
 GTK_DOC_CHECK([1.14],[--flavour no-tmpl])
 
 AC_CONFIG_FILES([