--- sh.h.orig	2010-02-12 00:08:13.154592400 -0500
+++ sh.h	2010-02-12 00:36:27.472804000 -0500
@@ -339,6 +339,12 @@
 # define ksh_strrchr_dirsep(p)  strrchr(p, DIRSEP)
 #endif
 
+#ifdef __CYGWIN__
+# define ARG0_HAS_DIRSEP(p) strpbrk(p, "/\\")
+#else
+# define ARG0_HAS_DIRSEP(p) ksh_strchr_dirsep(p)
+#endif
+
 typedef int bool_t;
 #define	FALSE	0
 #define	TRUE	1
--- exec.c.orig	1999-07-13 12:53:46.000000000 -0400
+++ exec.c	2010-02-12 00:38:05.809630600 -0500
@@ -569,7 +569,7 @@
 		rv = subst_exstat;
 		goto Leave;
 	} else if (!tp) {
-		if (Flag(FRESTRICTED) && ksh_strchr_dirsep(cp)) {
+		if (Flag(FRESTRICTED) && ARG0_HAS_DIRSEP(cp)) {
 			warningf(TRUE, "%s: restricted", cp);
 			rv = 1;
 			goto Leave;
@@ -985,7 +985,7 @@
 	char *fpath;			/* for function autoloading */
 	char *npath;
 
-	if (ksh_strchr_dirsep(name) != NULL) {
+	if (ARG0_HAS_DIRSEP(name) != NULL) {
 		insert = 0;
 		/* prevent FPATH search below */
 		flags &= ~FC_FUNC;
@@ -1220,7 +1220,7 @@
 	if (search_access(Xstring(xs, xp), mode, errnop) == 0) 
 		return Xstring(xs, xp); /* not Xclose() - xp may be wrong */
 #else /* OS2 */
-	if (ksh_strchr_dirsep(name)) {
+	if (ARG0_HAS_DIRSEP(name)) {
 		if (search_access(name, mode, errnop) == 0)
 			return (char *) name;
 		return NULL;