diff --git a/Makefile b/Makefile
index 29ebef0..64a0482 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ B64_OBJS?=src/b64/cencode.o
 FORMAT_OBJS?=src/formats/json.o src/formats/raw.o src/formats/common.o src/formats/custom-type.o
 HTTP_PARSER_OBJS?=src/http-parser/http_parser.o
 
-CFLAGS ?= -Wall -Wextra -Isrc -Isrc/jansson/src -Isrc/http-parser -MD
+CFLAGS ?= -std=c99 -Wall -Wextra -Isrc -Isrc/jansson/src -Isrc/http-parser -MD -D_POSIX_C_SOURCE=200809L -Wno-pragmas
 LDFLAGS ?= -levent -pthread
 
 # Pass preprocessor macros to the compile invocation
diff --git a/src/acl.c b/src/acl.c
index 160e6e5..61d1b5e 100644
--- a/src/acl.c
+++ b/src/acl.c
@@ -5,6 +5,7 @@
 #include "client.h"
 
 #include <string.h>
+#include <strings.h>
 #include <evhttp.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
diff --git a/src/client.c b/src/client.c
index 353b360..c54fab8 100644
--- a/src/client.c
+++ b/src/client.c
@@ -9,6 +9,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <unistd.h>
 #include <errno.h>
 #include <hiredis/hiredis.h>
diff --git a/src/cmd.c b/src/cmd.c
index 937e6ca..a77e079 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -16,6 +16,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <hiredis/hiredis.h>
 #include <hiredis/async.h>
 #include <ctype.h>
diff --git a/src/conf.c b/src/conf.c
index 904356e..2644d89 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <strings.h>
 #include <ctype.h>
 #include <arpa/inet.h>
 #include <unistd.h>
diff --git a/src/formats/json.c b/src/formats/json.c
index 0cbcb52..833e7b1 100644
--- a/src/formats/json.c
+++ b/src/formats/json.c
@@ -5,6 +5,7 @@
 #include "client.h"
 
 #include <string.h>
+#include <strings.h>
 #include <hiredis/hiredis.h>
 #include <hiredis/async.h>
 
diff --git a/src/formats/msgpack.c b/src/formats/msgpack.c
index a3190b7..0a6606e 100644
--- a/src/formats/msgpack.c
+++ b/src/formats/msgpack.c
@@ -5,6 +5,7 @@
 #include "client.h"
 
 #include <string.h>
+#include <strings.h>
 #include <hiredis/hiredis.h>
 #include <hiredis/async.h>
 
diff --git a/src/hiredis/fmacros.h b/src/hiredis/fmacros.h
index 3227faa..6da4238 100644
--- a/src/hiredis/fmacros.h
+++ b/src/hiredis/fmacros.h
@@ -2,7 +2,9 @@
 #define __HIREDIS_FMACRO_H
 
 #define _XOPEN_SOURCE 600
+#ifndef _POSIX_C_SOURCE
 #define _POSIX_C_SOURCE 200112L
+#endif
 
 #if defined(__APPLE__) && defined(__MACH__)
 /* Enable TCP_KEEPALIVE */
diff --git a/src/http.c b/src/http.c
index 9da29e1..89bd942 100644
--- a/src/http.c
+++ b/src/http.c
@@ -5,6 +5,7 @@
 #include "slog.h"
 
 #include <string.h>
+#include <strings.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdio.h>
diff --git a/src/server.c b/src/server.c
index 03fa3b9..be39792 100644
--- a/src/server.c
+++ b/src/server.c
@@ -200,7 +200,7 @@ server_daemonize(struct server *s, const char *pidfile) {
 
 	/* write pidfile */
 	if(pidfile) {
-		int pid_fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW, 0600);
+		int pid_fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 		if(pid_fd > 0) {
 			char pid_buffer[(CHAR_BIT * sizeof(int) / 3) + 3]; /* max length for int */
 			int pid_sz = snprintf(pid_buffer, sizeof(pid_buffer), "%d\n", (int)getpid());