Index: trunk/config.auto.h.in
===================================================================
--- trunk/config.auto.h.in	(revision 2545)
+++ trunk/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 [@
 
Index: trunk/scconfig/hooks.c
===================================================================
--- trunk/scconfig/hooks.c	(revision 2545)
+++ trunk/scconfig/hooks.c	(revision 2546)
@@ -173,6 +173,13 @@
 		}
 	}
 
+	if (require("libs/proc/wait",  0, 0) != 0) {
+		if (require("libs/proc/_spawnvp",  0, 0) != 0) {
+			report_repeat("\nERROR: no fork or _spawnvp. Can not compile pcb-rnd.\n\n");
+			return 1;
+		}
+	}
+
 	if (require("libs/fs/getcwd/*",  0, 0) != 0)
 		if (require("libs/fs/_getcwd/*",  0, 0) != 0)
 			if (require("libs/fs/getwd/*",  0, 0) != 0) {
Index: trunk/src/compat_fs.c
===================================================================
--- trunk/src/compat_fs.c	(revision 2545)
+++ trunk/src/compat_fs.c	(revision 2546)
@@ -45,13 +45,6 @@
 #include "compat_fs.h"
 #include "compat_misc.h"
 
-#ifndef HAVE__SPAWNVP
-/* The UNIX way of doing this: fork() and wait(). */
-#	include <sys/wait.h>
-#	include <unistd.h>
-#endif
-
-
 #include <genvector/gds_char.h>
 
 #include "global.h"
@@ -83,13 +76,13 @@
 
 int pcb_spawnvp(char **argv)
 {
-#ifdef HAVE__SPAWNVP
+#if defined(USE_SPAWNVP)
 	int result = _spawnvp(_P_WAIT, argv[0], (const char *const *) argv);
 	if (result == -1)
 		return 1;
 	else
 		return 0;
-#else
+#elif defined(USE_FORK_WAIT)
 	int pid;
 	pid = fork();
 	if (pid < 0) {
@@ -108,6 +101,8 @@
 		wait(&rv);
 	}
 	return 0;
+#else
+#	error Do not know how to run a background process.
 #endif
 }
 
Index: trunk/src/compat_inc.h.in
===================================================================
--- trunk/src/compat_inc.h.in	(revision 2545)
+++ trunk/src/compat_inc.h.in	(revision 2546)
@@ -5,7 +5,9 @@
 @?libs/fs/getcwd/includes@
 @?libs/fs/_getcwd/includes@
 @?libs/fs/getwd/includes@
-
+@?/target/libs/proc/wait/includes@
+@?/target/libs/proc/fork/includes@
+@?/target/libs/proc/_spawnvp/includes@
 @]
 
 put /tmpasm/IFS {\n}