replaced <regex.h> by "regex.h" to fetch the local file.

scsh/regexp/debug.c

@@ -4,7 +4,7 @@
 #include <limits.h>
 #include <stdlib.h>
 #include <sys/types.h>
-#include <regex.h>
+#include "regex.h"
 
 #include "utils.h"
 #include "regex2.h"

scsh/regexp/main.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h>
-#include <regex.h>
+#include "regex.h"
 #include <assert.h>
 
 #include "main.ih"

scsh/regexp/regcomp.c

@@ -4,7 +4,7 @@
 #include <ctype.h>
 #include <limits.h>
 #include <stdlib.h>
-#include <regex.h>
+#include "regex.h"
 
 #include "utils.h"
 #include "regex2.h"

scsh/regexp/regerror.c

@@ -4,7 +4,7 @@
 #include <ctype.h>
 #include <limits.h>
 #include <stdlib.h>
-#include <regex.h>
+#include "regex.h"
 
 #include "utils.h"
 #include "regerror.ih"

scsh/regexp/regexec.c

@@ -11,7 +11,7 @@
 #include <string.h>
 #include <limits.h>
 #include <ctype.h>
-#include <regex.h>
+#include "regex.h"
 
 #include "utils.h"
 #include "regex2.h"

scsh/regexp/regfree.c

@@ -1,7 +1,7 @@
 #include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <regex.h>
+#include "regex.h"
 
 #include "utils.h"
 #include "regex2.h"