--- opencryptoki/usr/lib/pkcs11/common/loadsave.c
+++ opencryptoki/usr/lib/pkcs11/common/loadsave.c
@@ -287,6 +287,9 @@
 //
 //
 
+/* _GNU_SOURCE necessary for asprintf */
+#define _GNU_SOURCE
+
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
--- opencryptoki/usr/lib/pkcs11/common/mech_rng.c
+++ opencryptoki/usr/lib/pkcs11/common/mech_rng.c
@@ -301,6 +301,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 
 #include "pkcs11types.h"
--- opencryptoki/usr/lib/pkcs11/tpm_stdll/tpm_specific.c
+++ opencryptoki/usr/lib/pkcs11/tpm_stdll/tpm_specific.c
@@ -31,6 +31,9 @@
  *
  */
 
+#define _GNU_SOURCE
+#include <stdio.h>
+
 #include <pthread.h>
 #include <string.h>
 #include <stdlib.h>
--- opencryptoki/usr/sbin/pkcsslotd/garbage_linux.c
+++ opencryptoki/usr/sbin/pkcsslotd/garbage_linux.c
@@ -294,6 +294,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 #include "log.h"
 #include "slotmgr.h"
--- opencryptoki/usr/sbin/pkcsslotd/mutex.c
+++ opencryptoki/usr/sbin/pkcsslotd/mutex.c
@@ -293,6 +293,9 @@
 #include <sys/types.h>
 #include <sys/file.h>
 #include <grp.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <unistd.h>
 
 #include "log.h"
 #include "slotmgr.h"
--- opencryptoki/usr/sbin/pkcsslotd/slotmgr.c
+++ opencryptoki/usr/sbin/pkcsslotd/slotmgr.c
@@ -292,6 +292,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
+#include <unistd.h>
 
 #include "log.h"
 #include "slotmgr.h"