added autoconf code to define MOO_PATH_MAX is PATH_MAX is defined in limits.h

moo/configure

@@ -19962,6 +19962,38 @@ rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
 fi
 
 
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for PATH_MAX" >&5
+$as_echo_n "checking for PATH_MAX... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+	#include <limits.h>
+int
+main ()
+{
+;;;;;;;;;;
+PATH_MAX
+  ;
+  return 0;
+}
+
+_ACEOF
+_value_of_path_max="`$ac_cv_prog_CPP conftest.c | awk '/;;;;;;;;;;/ { start=1 } /^(0|1|2|3|4|5|6|7|8|9)(0|1|2|3|4|5|6|7|8|9)*/ { if (start == 1) { print $0; start++; } }'`"
+if test "x${_value_of_path_max}" = "x"
+then
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: not defined" >&5
+$as_echo "not defined" >&6; }
+else
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ${_value_of_path_max}" >&5
+$as_echo "${_value_of_path_max}" >&6; }
+
+cat >>confdefs.h <<_ACEOF
+#define MOO_PATH_MAX ${_value_of_path_max}
+_ACEOF
+
+fi
+
 # The cast to long int works around a bug in the HP C Compiler
 # version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
 # declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.