# diff -Nurp pdftk/Makefile.Slackware-13.1.orig pdftk/Makefile.Slackware-13.1
--- orig/pdftk/Makefile.Slackware-13.1  2013-07-24 13:27:46.000000000 -0500
+++ pdftk/Makefile.Slackware-13.1       2018-03-04 06:20:55.312900883 -0600
@@ -21,8 +21,9 @@
 # tools
 # need direct path to libgcj for gcjh (starting in gcj 4.1.2 per AurĂ©lien GĂRĂME)
 TOOLPATH=
-export VERSUFF=-4.4.4
-export CXX= $(TOOLPATH)g++
+GCCMAJORTAG=-5                            # kjh was here
+export VERSUFF=-5.5.0                     # kjh was here
+export CXX= $(TOOLPATH)g++$(GCCMAJORTAG)  # kjh was here
 export GCJ= $(TOOLPATH)gcj
 export GCJH= $(TOOLPATH)gcjh
 export GJAR= $(TOOLPATH)gjar