diff -up ./configure.in.orig ./configure.in
--- ./configure.in.orig	2018-06-04 16:13:23.702825113 +0300
+++ ./configure.in	2018-06-04 16:13:49.111737693 +0300
@@ -39,9 +39,6 @@ AC_ARG_WITH(gtk2,
 if test "$compile_for" = "gtk2" ; then
   AM_PATH_GTK_2_0(2.2.0, ,
             AC_MSG_ERROR(Cannot find GTK2.))
-else
-  AM_PATH_GTK(1.2.0, ,
-            AC_MSG_ERROR(Cannot find GTK: Is gtk-config in path?))
 fi
 
 dnl Set PACKAGE_DATA_DIR in config.h.
diff -up ./doc/Makefile.am.orig ./doc/Makefile.am
--- ./doc/Makefile.am.orig	2018-06-04 16:29:00.268457897 +0300
+++ ./doc/Makefile.am	2018-06-04 16:31:33.725966378 +0300
@@ -6,7 +6,17 @@ docdir = $(datadir)/doc/$(PACKAGE)-$(VER
 
 CLEANFILES = index.html compatibility.html changelog.html license.html Xdialog.1
 
-doc_DATA = index.html compatibility.html changelog.html license.html $(srcdir)/*.html $(srcdir)/*.png
+HTMLFILES = authors.html \
+            box.html \
+            common.html \
+            faq.html \
+            gtk.html \
+            intro.html \
+            special.html \
+            syntax.html \
+            transient.html
+
+doc_DATA = index.html compatibility.html changelog.html license.html $(HTMLFILES) $(srcdir)/*.png
 
 man_MANS = Xdialog.1