Add build confirmation notice to configure
diff --git a/configure.ac b/configure.ac
index 963af2e..90ca102 100644
--- a/configure.ac
+++ b/configure.ac
@@ -275,3 +275,28 @@
])
AC_OUTPUT
+
+AC_MSG_NOTICE([
+
+Build configuration:
+
+Unicode callbacks (you want at least one):
+ Glib: ${have_glib}
+ ICU: ${have_icu}
+ UCDN: ${have_ucdn}
+
+Font callbacks (the more the better):
+ FreeType: ${have_freetype}
+
+Tools used for command-line utilities:
+ Cairo: ${have_cairo}
+
+Additional shapers (the more the better):
+ Graphite2: ${have_graphite}
+
+Test / platform shapers (not normally needed):
+ CoreText: ${have_coretext}
+ ICU Layout Engine: ${have_icu_le}
+ Old HarfBuzz: ${have_hb_old}
+ Uniscribe: ${have_uniscribe}
+])
