Very minor fixes.

tasks/libposix/SConstruct

@@ -14,7 +14,7 @@ l4lib_headers = join(project_root, "tasks/libl4/include")
 config_h = join(project_root, "include/l4/config.h")
 
 env = Environment(CC = 'arm-none-linux-gnueabi-gcc',
-		  CCFLAGS = ['-g', '-nostdlib', '-ffreestanding'],
+		  CCFLAGS = ['-g', '-std=gnu99', '-nostdlib', '-ffreestanding'],
 		  LINKFLAGS = ['-nostdlib'],
 		  ENV = {'PATH' : os.environ['PATH']},
 		  LIBS = 'gcc')

tasks/libposix/open.c

@@ -6,6 +6,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdarg.h>
+#include <string.h>
 #include <sys/shm.h>
 #include <sys/types.h>
 #include <sys/stat.h>