--- file_not_specified_in_diff	
+++ file_not_specified_in_diff	
@@ -, +, @@ 
--- Source/WebKit2/GNUmakefile.am
+++ Source/WebKit2/GNUmakefile.am
@@ -558,6 +558,7 @@ 
 	$(PANGO_LIBS) \
 	$(PNG_LIBS) \
 	$(SHLWAPI_LIBS) \
+	$(SHM_LIBS) \
 	$(SQLITE3_LIBS) \
 	$(UNICODE_LIBS) \
 	$(XRENDER_LIBS) \
--- configure.ac
+++ configure.ac
@@ -1368,6 +1368,14 @@ 
    if test "$have_gtk_unix_printing" = "yes"; then
        AC_DEFINE([HAVE_GTK_UNIX_PRINTING], [1], [Define if GTK+ UNIX Printing is available])
    fi
+
+
+   # On some Linux/Unix platforms, shm_* may only be available if linking
+   # against librt
+   if test "$os_win32" = "no"; then
+       AC_SEARCH_LIBS([shm_open], [rt], [SHM_LIBS="-lrt"])
+       AC_SUBST(SHM_LIBS)
+   fi
 fi
 
 # Plugin Process