diff --git a/CMakeLists.txt b/CMakeLists.txt
index afad8123e..09f37d6d8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 2.8.5)
 project(sway C)
 set(CMAKE_C_FLAGS "-g")
 set(CMAKE_C_STANDARD 99)
+SET(CMAKE_C_EXTENSIONS OFF)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "bin/")
 add_definitions("-Wall -Wextra -Wno-unused-parameter")
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PROJECT_SOURCE_DIR}/CMake)
diff --git a/include/stringop.h b/include/stringop.h
index dc81cdae6..49bfa771d 100644
--- a/include/stringop.h
+++ b/include/stringop.h
@@ -2,8 +2,13 @@
 #define _SWAY_STRINGOP_H
 #include "list.h"
 
+#if !HAVE_DECL_SETENV
+// Not sure why we need to provide this
+extern int setenv(const char *, const char *, int);
+#endif
+
 // array of whitespace characters to use for delims
-extern const char *whitespace;
+extern const char whitespace[];
 
 char *strip_whitespace(char *str);
 char *strip_comments(char *str);
diff --git a/sway/commands.c b/sway/commands.c
index f2ee01843..80770e87f 100644
--- a/sway/commands.c
+++ b/sway/commands.c
@@ -5,8 +5,10 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>
+#include <strings.h>
 #include <unistd.h>
 #include <ctype.h>
+#include <sys/types.h>
 #include "stringop.h"
 #include "layout.h"
 #include "focus.h"
@@ -193,7 +195,7 @@ static enum cmd_status cmd_exec_always(int argc, char **argv) {
 	sway_log(L_DEBUG, "Executing %s", cmd);
 
 	pid_t pid;
-	if ((pid = vfork()) == 0) {
+	if ((pid = fork()) == 0) {
 		execv("/bin/sh", args);
 		_exit(-1);
 	} else if (pid < 0) {
diff --git a/sway/container.c b/sway/container.c
index d6bcc4c24..4c523827c 100644
--- a/sway/container.c
+++ b/sway/container.c
@@ -1,7 +1,9 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <strings.h>
+#include <string.h>
 #include "config.h"
+#include "stringop.h"
 #include "container.h"
 #include "workspace.h"
 #include "focus.h"
diff --git a/sway/log.c b/sway/log.c
index 3859fd925..a206d9719 100644
--- a/sway/log.c
+++ b/sway/log.c
@@ -80,9 +80,7 @@ void sway_log_errno(log_importance_t verbosity, char* format, ...) {
 		va_end(args);
 
 		fprintf(stderr, ": ");
-		char error[256];
-		strerror_r(errno, error, sizeof(error));
-		fprintf(stderr, "%s", error);
+		fprintf(stderr, "%s", strerror(errno));
 
 		if (colored && isatty(STDERR_FILENO)) {
 			fprintf(stderr, "\x1B[0m");
diff --git a/sway/main.c b/sway/main.c
index e03588ea4..669211840 100644
--- a/sway/main.c
+++ b/sway/main.c
@@ -3,9 +3,11 @@
 #include <stdbool.h>
 #include <wlc/wlc.h>
 #include <sys/wait.h>
+#include <sys/types.h>
 #include <signal.h>
 #include <getopt.h>
 #include "layout.h"
+#include "stringop.h"
 #include "config.h"
 #include "log.h"
 #include "readline.h"
diff --git a/sway/stringop.c b/sway/stringop.c
index 90f963d6d..31a036c35 100644
--- a/sway/stringop.c
+++ b/sway/stringop.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <strings.h>
 #include <ctype.h>
 #include "stringop.h"
@@ -7,7 +8,7 @@
 #include "string.h"
 #include "list.h"
 
-const char *whitespace = " \f\n\r\t\v";
+const char whitespace[] = " \f\n\r\t\v";
 
 /* Note: This returns 8 characters for trimmed_start per tab character. */
 char *strip_whitespace(char *_str) {
@@ -313,13 +314,16 @@ char *join_list(list_t *list, char *separator) {
 }
 
 char *cmdsep(char **stringp, const char *delim) {
-	char *head = strsep(stringp, delim);
-	// But skip over trailing delims. '3   tokens  here' -> '3' 'tokens  here'
-	if (*stringp) {
-		*stringp += strspn(*stringp, delim);
-		// If skiping over delims brings us to the end of string, set to NULL
-		if (!**stringp) *stringp = NULL;
-	}
+	// skip over leading delims
+	char *head = *stringp + strspn(*stringp, delim);
+	// Find end token
+	char *tail = *stringp += strcspn(*stringp, delim);
+	// Set stringp to begining of next token
+	*stringp += strspn(*stringp, delim);
+	// Set stringp to null if last token
+	if (!**stringp) *stringp = NULL;
+	// Nullify end of first token
+	*tail = 0;
 	return head;
 }
 
@@ -358,3 +362,12 @@ char *argsep(char **stringp, const char *delim) {
 	found:
 	return start;
 }
+
+char *strdup(const char *str) {
+	char *dup = malloc(strlen(str) + 1);
+	if (dup) {
+		strcpy(dup, str);
+	}
+	return dup;
+}
+
diff --git a/sway/workspace.c b/sway/workspace.c
index 658f79bc7..c169c1cb8 100644
--- a/sway/workspace.c
+++ b/sway/workspace.c
@@ -2,6 +2,7 @@
 #include <stdbool.h>
 #include <wlc/wlc.h>
 #include <string.h>
+#include <strings.h>
 #include "workspace.h"
 #include "layout.h"
 #include "list.h"