diff -up xpdf-4.00/fofi/CMakeLists.txt.versionedlib xpdf-4.00/fofi/CMakeLists.txt
--- xpdf-4.00/fofi/CMakeLists.txt.versionedlib	2017-08-08 19:22:50.000000000 -0400
+++ xpdf-4.00/fofi/CMakeLists.txt	2017-08-16 20:06:18.106884951 -0400
@@ -24,3 +24,5 @@ add_library(fofi_objs OBJECT
 add_library(fofi
   $<TARGET_OBJECTS:fofi_objs>
 )
+
+set_target_properties(fofi PROPERTIES VERSION 4 SOVERSION 4)
diff -up xpdf-4.00/goo/CMakeLists.txt.versionedlib xpdf-4.00/goo/CMakeLists.txt
--- xpdf-4.00/goo/CMakeLists.txt.versionedlib	2017-08-08 19:22:50.000000000 -0400
+++ xpdf-4.00/goo/CMakeLists.txt	2017-08-16 20:06:00.525277924 -0400
@@ -25,3 +25,5 @@ add_library(goo_objs OBJECT
 add_library(goo
   $<TARGET_OBJECTS:goo_objs>
 )
+
+set_target_properties(goo PROPERTIES VERSION 4 SOVERSION 4)
diff -up xpdf-4.00/splash/CMakeLists.txt.versionedlib xpdf-4.00/splash/CMakeLists.txt
--- xpdf-4.00/splash/CMakeLists.txt.versionedlib	2017-08-08 19:22:50.000000000 -0400
+++ xpdf-4.00/splash/CMakeLists.txt	2017-08-16 20:06:41.204368689 -0400
@@ -44,4 +44,5 @@ if (HAVE_SPLASH)
   add_library(splash
     $<TARGET_OBJECTS:splash_objs>
   )
+  set_target_properties(splash PROPERTIES VERSION 4 SOVERSION 4)
 endif ()