--- a/CMakeLists.txt.orig	2019-01-10 21:45:56.000000000 +0800
+++ b/CMakeLists.txt	2019-02-19 21:56:11.651398683 +0800
@@ -576,15 +576,9 @@
 source_group("Include\\EVM" FILES ${HEADERS_EVM})
 
 ### test library 64bit routine:
-get_property(LIB64 GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS)
+include("GNUInstallDirs")
 
-if (NOT APPLE AND "${LIB64}" STREQUAL "TRUE")
-    set(LIBSUFFIX 64)
-else()
-    set(LIBSUFFIX "")
-endif()
-
-set(INSTALL_LIB_DIR     lib${LIBSUFFIX} CACHE PATH "Installation directory for libraries")
+set(INSTALL_LIB_DIR    ${CMAKE_INSTALL_LIBDIR} CACHE PATH "Installation directory for libraries")
 mark_as_advanced(INSTALL_LIB_DIR)
 
 ## installation
@@ -611,5 +605,5 @@
 target_link_libraries(cstool ${default-target})
 
 install(TARGETS cstool DESTINATION bin)
-install(FILES ${CMAKE_BINARY_DIR}/capstone.pc DESTINATION lib/pkgconfig)
+install(FILES ${CMAKE_BINARY_DIR}/capstone.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 endif ()