Index: config.auto.h.in
===================================================================
--- config.auto.h.in	(revision 2545)
+++ config.auto.h.in	(revision 2546)
@@ -26,9 +26,6 @@
 /* Define to 1 if you have the <sys/types.h> header file. */
 #define HAVE_SYS_TYPES_H 1
 
-/* Define to 1 if you have the `_spawnvp' function. */
-/* #undef HAVE__SPAWNVP */
-
 /* Define if mkdir takes only one argument. */
 /* #undef MKDIR_TAKES_ONE_ARG */
 
@@ -113,6 +110,10 @@
 print {\n\n/* Define to 1 if we should use windows api for dynamic linking. */\n}
 print_ternary ?libs/LoadLibrary/presents {#define USE_LOADLIBRARY 1} {/* #undef USE_LOADLIBRARY */}
 
+print {\n\n/* Select which mechanism to use for running child processes. */\n}
+print_ternary ?/target/libs/proc/wait/presents     {#define USE_FORK_WAIT 1} {/* #undef USE_FORK_WAIT */}
+print {\n}
+print_ternary ?/target/libs/proc/_spawnvp/presents {#define USE_SPAWNVP 1}   {/* #undef USE_SPAWNVP */}
 
 print [@