Work with buildroot's extensively patched uClibc, and for nommu support move xfork() to portability.h and #ifdef based on __uClinux__ (which seems to be the nommu compiler define).

lib/lib.h

@@ -93,7 +93,6 @@ void xprintf(char *format, ...);
 void xputs(char *s);
 void xputc(char c);
 void xflush(void);
-pid_t xfork(void);
 void xexec_optargs(int skip);
 void xexec(char **argv);
 pid_t xpopen_both(char **argv, int *pipes);

lib/portability.c

@@ -6,6 +6,17 @@
 
 #include "toys.h"
 
+#if !defined(__uClinux__)
+pid_t xfork(void)
+{
+  pid_t pid = fork();
+
+  if (pid < 0) perror_exit("fork");
+
+  return pid;
+}
+#endif
+
 #if defined(__APPLE__)
 ssize_t getdelim(char **linep, size_t *np, int delim, FILE *stream)
 {

lib/portability.h

@@ -72,13 +72,28 @@ pid_t getsid(pid_t pid);
 // any flag newer than MS_MOVE, which was added in 2001 (linux 2.5.0.5),
 // eleven years earlier.
 
+#include <sys/mount.h>
+#ifndef MS_MOVE
 #define MS_MOVE       (1<<13)
+#endif
+#ifndef MS_REC
 #define MS_REC        (1<<14)
+#endif
+#ifndef MS_SILENT
 #define MS_SILENT     (1<<15)
+#endif
+#ifndef MS_UNBINDABLE
 #define MS_UNBINDABLE (1<<17)
+#endif
+#ifndef MS_PRIVATE
 #define MS_PRIVATE    (1<<18)
+#endif
+#ifndef MS_SLAVE
 #define MS_SLAVE      (1<<19)
+#endif
+#ifndef MS_SHARED
 #define MS_SHARED     (1<<20)
+#endif
 
 // When building under obsolete glibc (Ubuntu 8.04-ish), hold its hand a bit.
 #elif __GLIBC__ == 2 && __GLIBC_MINOR__ < 10
@@ -206,3 +221,9 @@ typedef double FLOAT;
 typedef float FLOAT;
 #endif
 
+#ifndef __uClinux__
+pid_t xfork(void);
+#endif
+
+//#define strncpy(...) @@strncpyisbadmmkay@@
+//#define strncat(...) @@strcatisbadmmkay@@

lib/xwrap.c

@@ -127,15 +127,6 @@ void xflush(void)
   if (fflush(stdout) || ferror(stdout)) perror_exit("write");;
 }
 
-pid_t xfork(void)
-{
-  pid_t pid = fork();
-
-  if (pid < 0) perror_exit("fork");
-
-  return pid;
-}
-
 // Call xexec with a chunk of optargs, starting at skip. (You can't just
 // call xexec() directly because toy_init() frees optargs.)
 void xexec_optargs(int skip)