--- a/cmake/modules/instdirs.cmake
+++ b/cmake/modules/instdirs.cmake
@@ -44,28 +44,28 @@
 
 set(
   CMAKE_INSTALL_BINDIR
-  ${CMAKE_INSTALL_EXEC_PREFIX}/bin
+  bin
   CACHE PATH "General install location for user executables"
   )
 list(APPEND INSTALL_LOCATION_VARIABLES_LIST CMAKE_INSTALL_BINDIR)
 
 set(
   CMAKE_INSTALL_DATADIR
-  ${CMAKE_INSTALL_PREFIX}/share
+  share
   CACHE PATH "General install location for read-only architecture-independent data"
   )
 list(APPEND INSTALL_LOCATION_VARIABLES_LIST CMAKE_INSTALL_DATADIR)
 
 set(
   CMAKE_INSTALL_LIBDIR
-  ${CMAKE_INSTALL_EXEC_PREFIX}/lib
+  lib
   CACHE PATH "General install location for object code libraries"
   )
 list(APPEND INSTALL_LOCATION_VARIABLES_LIST CMAKE_INSTALL_LIBDIR)
 
 set(
   CMAKE_INSTALL_INCLUDEDIR
-  ${CMAKE_INSTALL_PREFIX}/include
+  include
   CACHE PATH "General install location for C header files"
   )
 list(APPEND INSTALL_LOCATION_VARIABLES_LIST CMAKE_INSTALL_INCLUDEDIR)