modules: updated FindCorrade.cmake.

modules/FindCorrade.cmake

@@ -11,6 +11,9 @@
 #
 #  Corrade_FOUND                  - Whether the base library was found
 #  CORRADE_LIB_SUFFIX_MODULE      - Path to CorradeLibSuffix.cmake module
+#  CORRADE_INCLUDE_INSTALL_PREFIX - Prefix where to put platform-independent
+#   include and other files, defaults to ``.``. If a relative path is used,
+#   it's relative to :variable:`CMAKE_INSTALL_PREFIX`.
 #
 # This command will try to find only the base library, not the optional
 # components, which are:
@@ -557,3 +560,9 @@ find_package_handle_standard_args(Corrade REQUIRED_VARS
 
 # Finalize the finding process
 include(${CORRADE_USE_MODULE})
+
+# Installation dirs
+set(CORRADE_INCLUDE_INSTALL_PREFIX "."
+    CACHE STRING "Prefix where to put platform-independent include and other files")
+
+set(CORRADE_INCLUDE_INSTALL_DIR ${CORRADE_INCLUDE_INSTALL_PREFIX}/include/Corrade)