diff -Naur poppler-0.63.0.orig/cmake/modules/FindGTK.cmake poppler-0.63.0.new/cmake/modules/FindGTK.cmake
--- poppler-0.63.0.orig/cmake/modules/FindGTK.cmake	2018-03-18 14:23:49.000000000 -0400
+++ poppler-0.63.0.new/cmake/modules/FindGTK.cmake	2018-10-15 00:22:06.696025980 -0400
@@ -4,6 +4,7 @@
 #  GTK_FOUND - system has GTK
 #  GTK3_CFLAGS - the GTK CFlags
 #  GTK3_LIBRARIES - Link these to use GTK
+#  GTK3_INCLUDE_DIRS - the GTK header file locations
 #
 # Copyright 2008-2010 Pino Toscano, <pino@kde.org>
 #
@@ -17,6 +18,6 @@
 
   pkg_check_modules(GTK3 "gtk+-3.0>=3.8" "gdk-pixbuf-2.0")
 
-  find_package_handle_standard_args(GTK DEFAULT_MSG GTK3_LIBRARIES GTK3_CFLAGS)
+  find_package_handle_standard_args(GTK DEFAULT_MSG GTK3_LIBRARIES GTK3_INCLUDE_DIRS GTK3_CFLAGS)
 
 endif(NOT WIN32)