diff -up ./CMakeLists.txt.rubydir ./CMakeLists.txt
--- ./CMakeLists.txt.rubydir	2020-08-20 17:47:09.856575432 -0400
+++ ./CMakeLists.txt	2020-08-20 17:47:30.133444682 -0400
@@ -72,6 +72,7 @@ endif()
 set (INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR}/sdformat-${SDF_VERSION}/sdf")
 set (LIB_INSTALL_DIR ${CMAKE_INSTALL_LIBDIR} CACHE STRING "Installation directory for libraries (relative to CMAKE_INSTALL_PREFIX)")
 set (BIN_INSTALL_DIR ${CMAKE_INSTALL_BINDIR} CACHE STRING "Installation directory for binaries (relative to CMAKE_INSTALL_PREFIX)")
+set (RUBY_LIB_INSTALL_DIR "lib/ruby" CACHE STRING "Installation directory for ruby scripts (relative to CMAKE_INSTALL_PREFIX)")
 set (USE_FULL_RPATH OFF CACHE BOOL "Set to true to enable full rpath")
 
 set(PKG_NAME SDFormat)
diff -up ./src/cmd/CMakeLists.txt.rubydir ./src/cmd/CMakeLists.txt
--- ./src/cmd/CMakeLists.txt.rubydir	2020-08-20 17:47:09.857575425 -0400
+++ ./src/cmd/CMakeLists.txt	2020-08-20 17:49:04.316695562 -0400
@@ -41,4 +41,4 @@ file(GENERATE
   INPUT  "${cmd_script_configured}")
 
 # Install the ruby command line library in an unversioned location.
-install(FILES ${cmd_script_generated} DESTINATION lib/ruby/ignition)
+install(FILES ${cmd_script_generated} DESTINATION ${RUBY_LIB_INSTALL_DIR}/ignition)