diff -u -r ../fish-2.4b1/configure.ac ./configure.ac
--- ../fish-2.4b1/configure.ac	2016-10-18 10:17:06.000000000 -0400
+++ ./configure.ac	2016-10-19 17:39:47.630582854 -0400
@@ -251,8 +251,7 @@
 
 # Check for os dependant libraries for all binaries.
 AC_SEARCH_LIBS( connect, socket, , [AC_MSG_ERROR([Cannot find the socket library, needed to build this package.] )] )
 AC_SEARCH_LIBS( nanosleep, rt, , [AC_MSG_ERROR([Cannot find the rt library, needed to build this package.] )] )
-AC_SEARCH_LIBS( shm_open, rt, , [AC_MSG_ERROR([Cannot find the rt library, needed to build this package.] )] )
 AC_SEARCH_LIBS( pthread_create, pthread, , [AC_MSG_ERROR([Cannot find the pthread library, needed to build this package.] )] )
 AC_SEARCH_LIBS( setupterm, [ncurses tinfo curses], , [AC_MSG_ERROR([Could not find a curses implementation, needed to build fish. If this is Linux, try running 'sudo apt-get install libncurses5-dev' or 'sudo yum install ncurses-devel'])] )
 AC_SEARCH_LIBS( [dladdr], [dl] )