diff -up libsolv/bindings/ruby/CMakeLists.txt.rubyinclude libsolv/bindings/ruby/CMakeLists.txt
--- libsolv/bindings/ruby/CMakeLists.txt.rubyinclude	2012-06-07 10:06:19.372687533 +0200
+++ libsolv/bindings/ruby/CMakeLists.txt	2012-06-07 10:09:57.313968719 +0200
@@ -6,8 +6,17 @@ ELSE (USE_VENDORDIRS AND RUBY_VENDORARCH
     SET (RUBY_INSTALL_DIR ${RUBY_SITEARCH_DIR})
 ENDIF (USE_VENDORDIRS AND RUBY_VENDORARCH_DIR)
 
+EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['arch']"
+   OUTPUT_VARIABLE RUBY_ARCH)
+
+EXECUTE_PROCESS(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['rubyhdrdir']"
+   OUTPUT_VARIABLE RUBY_HDR_DIR)
+
+SET(RUBY_INCLUDE_DIRS ${RUBY_HDR_DIR} ${RUBY_HDR_DIR}/${RUBY_ARCH})
+
 MESSAGE (STATUS "Ruby executable: ${RUBY_EXECUTABLE}")
 MESSAGE (STATUS "Ruby installation dir: ${RUBY_INSTALL_DIR}")
+MESSAGE (STATUS "Ruby include dir: ${RUBY_INCLUDE_DIRS}")
 
 ADD_CUSTOM_COMMAND (
     OUTPUT solv_ruby.c
@@ -17,7 +26,7 @@ ADD_CUSTOM_COMMAND (
 )
 
 ADD_DEFINITIONS(-Wno-unused)
-INCLUDE_DIRECTORIES (${RUBY_INCLUDE_PATH})
+INCLUDE_DIRECTORIES (${RUBY_INCLUDE_DIRS})
 
 ADD_LIBRARY (bindings_ruby SHARED solv_ruby.c)
 SET_TARGET_PROPERTIES (bindings_ruby PROPERTIES PREFIX "" OUTPUT_NAME "solv")