Allow compilation on Darwin

diff --git a/netcat.c b/netcat.c
index a0fb51b..bbb5dd1 100644
--- a/netcat.c
+++ b/netcat.c
@@ -51,11 +51,13 @@
 # include <bsd/readpassphrase.h>
 #endif
 
+#ifndef IPTOS_LOWCOST
+# define IPTOS_LOWCOST 0x02
+#endif
 #ifndef IPTOS_LOWDELAY
 # define IPTOS_LOWDELAY 0x10
 # define IPTOS_THROUGHPUT 0x08
 # define IPTOS_RELIABILITY 0x04
-# define IPTOS_LOWCOST 0x02
 # define IPTOS_MINCOST IPTOS_LOWCOST
 #endif /* IPTOS_LOWDELAY */
 
@@ -108,8 +110,9 @@
 # include <tls.h>
 #endif
 #include <unistd.h>
-#include <bsd/stdlib.h>
-#include <bsd/string.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
 
 #include "atomicio.h"
 
@@ -240,6 +243,43 @@ static int connect_with_timeout(int fd, const struct sockaddr *sa,
 
 static void quit();
 
+static char* strtonumerrs[] = {
+	"too large",
+	"too small",
+	"invalid"
+};
+
+static long long
+strtonum(
+		const char *nptr,
+		long long minval,
+		long long maxval,
+		const char **errstr)
+{
+	long long val;
+
+	while (*nptr != '\0' && isspace(*nptr))
+		nptr++;
+	if (*nptr == '\0') {
+		if (errstr != NULL)
+			*errstr = strtonumerrs[2];
+		return 0;
+	}
+	val = atoll(nptr);
+	if (val < minval) {
+		if (errstr != NULL)
+			*errstr = strtonumerrs[1];
+		return 0;
+	}
+	if (val > maxval) {
+		if (errstr != NULL)
+			*errstr = strtonumerrs[0];
+		return 0;
+	}
+	*errstr = NULL;
+	return val;
+}
+
 int
 main(int argc, char *argv[])
 {
diff --git a/socks.c b/socks.c
index 9068f39..68b68e3 100644
--- a/socks.c
+++ b/socks.c
@@ -38,7 +38,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <resolv.h>
-#include <bsd/readpassphrase.h>
+#include <readpassphrase.h>
 #include "atomicio.h"
 
 #define SOCKS_PORT	"1080"