Patch borrowed from
http://cgit.openembedded.org/cgit.cgi/openembedded/tree/recipes/mysql/files/configure-ps-cache-check.patch

It allows to specify through ac_cv_FIND_PROC how ps should be used on
the target to find the PID of a program.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

---
 configure.in |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Index: mysql-5.1.53/configure.in
===================================================================
--- mysql-5.1.53.orig/configure.in
+++ mysql-5.1.53/configure.in
@@ -462,8 +462,8 @@
 # then Make, then shell.  The autoconf substitution uses single quotes, so 
 # no unprotected single quotes should appear in the expression.
 AC_PATH_PROG(PS, ps, ps)
-AC_MSG_CHECKING("how to check if pid exists")
-PS=$ac_cv_path_PS
+AC_CACHE_CHECK([how to check if pid exists], [ac_cv_FIND_PROC],
+[
 # Linux style
 if $PS wwwp $$ 2> /dev/null | grep -- "$0" > /dev/null
 then
@@ -502,8 +502,9 @@
       AC_MSG_ERROR([Could not find the right ps and/or grep switches. Which OS is this?  See the Installation chapter in the Reference Manual.])
   esac
 fi
-AC_SUBST(FIND_PROC)
-AC_MSG_RESULT("$FIND_PROC")
+ac_cv_FIND_PROC="$FIND_PROC"
+])
+AC_SUBST([FIND_PROC], [$ac_cv_FIND_PROC])
 
 # Check if a pid is valid
 AC_PATH_PROG(KILL, kill, kill)