GNUInstallDirs support (#159)

Author: extrowerk

CMakeLists.txt

@@ -51,15 +51,17 @@ set_target_properties (utf8proc PROPERTIES
 )
 
 if (UTF8PROC_INSTALL)
+  include(GNUInstallDirs)
+  mark_as_advanced(CLEAR CMAKE_INSTALL_LIBDIR CMAKE_INSTALL_INCLUDEDIR)
   install(TARGETS utf8proc
-    RUNTIME DESTINATION bin
-    LIBRARY DESTINATION lib
-    ARCHIVE DESTINATION lib)
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${INSTALL_SUFFIX}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${INSTALL_SUFFIX})
 
   install(
     FILES
       "${PROJECT_SOURCE_DIR}/utf8proc.h"
-    DESTINATION include)
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}${INSTALL_SUFFIX})
 endif()
 
 if(UTF8PROC_ENABLE_TESTING)