diff -up gl2ps-1.4.2/CMakeLists.txt.sover gl2ps-1.4.2/CMakeLists.txt
--- gl2ps-1.4.2/CMakeLists.txt.sover	2020-07-03 17:53:44.591202291 +0200
+++ gl2ps-1.4.2/CMakeLists.txt	2020-07-03 17:54:39.145593296 +0200
@@ -156,6 +156,10 @@ if(OPENGL_FOUND)
                              ARCHIVE DESTINATION lib${LIB_SUFFIX})
 endif()
 
+set_target_properties(shared PROPERTIES
+                      VERSION ${GL2PS_MAJOR_VERSION}.${GL2PS_MINOR_VERSION}.${GL2PS_PATCH_VERSION}
+                      SOVERSION ${GL2PS_MAJOR_VERSION}) 
+
 if(WIN32)
   set(GL2PS_DOC .)
 else()