--- gtk+3.0-3.14.12/configure.ac	2015-04-14 17:31:32.000000000 -0500
+++ fixed/configure.ac	2015-04-14 17:34:39.898579402 -0500
@@ -481,6 +481,7 @@
   GDK_WINDOWING="$GDK_WINDOWING
 #define GDK_WINDOWING_MIR"
   MIR_PACKAGES="$MIR_DEPENDENCIES"
+  have_gio_unix=yes
 
   AM_CONDITIONAL(USE_MIR, true)
 else