diff --git a/client/configure b/client/configure
index 2aff14ba15..bcdc102270 100644
--- a/client/configure
+++ b/client/configure
@@ -1548,7 +1548,7 @@ EOF
 
 fi
 
-for ac_hdr in fcntl.h malloc.h sys/time.h unistd.h sys/select.h sys/statvfs.h sys/swap.h sys/systeminfo.h sys/socket.h sys/types.h dirent.h sys/utsname.h netdb.h netinet/in.h netinet/tcp.h arpa/inet.h sys/resource.h signal.h sys/wait.h sys/mount.h
+for ac_hdr in fcntl.h malloc.h sys/time.h unistd.h sys/select.h sys/statvfs.h sys/swap.h sys/systeminfo.h sys/socket.h sys/types.h dirent.h sys/utsname.h netdb.h netinet/in.h netinet/tcp.h arpa/inet.h sys/resource.h signal.h sys/wait.h sys/mount.h sys/ipc.h sys/shm.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
diff --git a/client/configure.in b/client/configure.in
index 330dcff383..e8d8cc1a36 100644
--- a/client/configure.in
+++ b/client/configure.in
@@ -38,7 +38,7 @@ AC_CHECK_LIB(stdc++, main)
 dnl Checks for header files.
 AC_HEADER_DIRENT
 AC_HEADER_STDC
-AC_CHECK_HEADERS(fcntl.h malloc.h sys/time.h unistd.h sys/select.h sys/statvfs.h sys/swap.h sys/systeminfo.h sys/socket.h sys/types.h dirent.h sys/utsname.h netdb.h netinet/in.h netinet/tcp.h arpa/inet.h sys/resource.h signal.h sys/wait.h sys/mount.h)
+AC_CHECK_HEADERS(fcntl.h malloc.h sys/time.h unistd.h sys/select.h sys/statvfs.h sys/swap.h sys/systeminfo.h sys/socket.h sys/types.h dirent.h sys/utsname.h netdb.h netinet/in.h netinet/tcp.h arpa/inet.h sys/resource.h signal.h sys/wait.h sys/mount.h sys/ipc.h sys/shm.h)
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST