$OpenBSD: patch-Modules_FindRuby_cmake,v 1.7 2013/06/06 12:47:06 dcoppa Exp $
Add support for rubyarchhdrdir and rubyarchlibdir, with fallback to "defaults"
on systems that have such directories but RbConfig doesn't have such options.
--- Modules/FindRuby.cmake.orig	Wed May 15 19:38:12 2013
+++ Modules/FindRuby.cmake	Tue May 28 20:02:18 2013
@@ -101,6 +101,16 @@ if(RUBY_EXECUTABLE  AND NOT  RUBY_VERSION_MAJOR)
    _RUBY_CONFIG_VAR("sitearchdir" RUBY_SITEARCH_DIR)
    _RUBY_CONFIG_VAR("sitelibdir" RUBY_SITELIB_DIR)
 
+   # not implemented in <2.0 but sometimes used
+   _RUBY_CONFIG_VAR("rubyarchhdrdir" RUBY_ARCHHDR_DIR)
+   if(NOT RUBY_ARCHHDR_DIR)
+      set(RUBY_ARCHHDR_DIR ${RUBY_HDR_DIR}/${RUBY_ARCH})
+   endif(NOT RUBY_ARCHHDR_DIR)
+   _RUBY_CONFIG_VAR("rubyarchlibdir" RUBY_ARCHLIB_DIR)
+   if(NOT RUBY_ARCHLIB_DIR)
+      set(RUBY_ARCHLIB_DIR ${RUBY_LIB_DIR}/${RUBY_ARCH})
+   endif(NOT RUBY_ARCHLIB_DIR)
+
    # vendor_ruby available ?
    execute_process(COMMAND ${RUBY_EXECUTABLE} -r vendor-specific -e "print 'true'"
       OUTPUT_VARIABLE RUBY_HAS_VENDOR_RUBY  ERROR_QUIET)
@@ -121,6 +131,8 @@ if(RUBY_EXECUTABLE  AND NOT  RUBY_VERSION_MAJOR)
    set(RUBY_SITEARCH_DIR     ${RUBY_SITEARCH_DIR}     CACHE PATH "The Ruby site arch dir" FORCE)
    set(RUBY_SITELIB_DIR      ${RUBY_SITELIB_DIR}      CACHE PATH "The Ruby site lib dir" FORCE)
    set(RUBY_HAS_VENDOR_RUBY  ${RUBY_HAS_VENDOR_RUBY}  CACHE BOOL "Vendor Ruby is available" FORCE)
+   set(RUBY_ARCHHDR_DIR      ${RUBY_ARCHHDR_DIR}      CACHE PATH "The Ruby arch-specific header dir (1.9+)" FORCE)
+   set(RUBY_ARCHLIB_DIR      ${RUBY_ARCHLIBDIR}       CACHE PATH "The Ruby arch-specific lib dir (1.9+)" FORCE)
    set(RUBY_VENDORARCH_DIR   ${RUBY_VENDORARCH_DIR}   CACHE PATH "The Ruby vendor arch dir" FORCE)
    set(RUBY_VENDORLIB_DIR    ${RUBY_VENDORLIB_DIR}    CACHE PATH "The Ruby vendor lib dir" FORCE)
 
@@ -133,6 +145,8 @@ if(RUBY_EXECUTABLE  AND NOT  RUBY_VERSION_MAJOR)
      RUBY_SITEARCH_DIR
      RUBY_SITELIB_DIR
      RUBY_HAS_VENDOR_RUBY
+     RUBY_ARCHHDR_DIR
+     RUBY_ARCHLIB_DIR
      RUBY_VENDORARCH_DIR
      RUBY_VENDORLIB_DIR
      RUBY_VERSION_MAJOR
@@ -166,6 +180,7 @@ find_path(RUBY_INCLUDE_DIR
    NAMES ruby.h
    HINTS
    ${RUBY_HDR_DIR}
+   ${RUBY_ARCHHDR_DIR}
    ${RUBY_ARCH_DIR}
    /usr/lib/ruby/${_RUBY_VERSION_SHORT}/i586-linux-gnu/ )
 
@@ -176,6 +191,7 @@ if( "${Ruby_FIND_VERSION_SHORT_NODOT}" GREATER 18  OR 
    find_path(RUBY_CONFIG_INCLUDE_DIR
      NAMES ruby/config.h  config.h
      HINTS
+     ${RUBY_ARCHHDR_DIR}
      ${RUBY_HDR_DIR}/${RUBY_ARCH}
      ${RUBY_ARCH_DIR}
      )
