Dependence on gengetopt

[bosilca]

I can't find this tool on any of the clusters I have access to. Here is a patch that will complain during configure about the missing tool instead of breaking during compilation.

diff --git a/configure.ac b/configure.ac
index 22b3943..507687d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,6 +90,10 @@ dnl AC_CHECK_FUNCS([kill memset snprintf strcasecmp strerror strstr setlinebuf g
 AC_CHECK_FUNCS([gethostname memset strcasecmp strerror strstr])


+AC_CHECK_PROG([GENGETOPT], [gengetopt], [yes], [no])
+AS_IF([test "$GENGETOPT" == "no"],
+      [AC_MSG_ERROR( [gengetopt is required but cannot be found])])
+
 AC_CONFIG_FILES([Makefile])

 AS_MKDIR_P([coll])