diff --git a/libsigrok/input/in_wav.c b/libsigrok/input/in_wav.c
index 3758c6a..9ae63eb 100644
--- a/libsigrok/input/in_wav.c
+++ b/libsigrok/input/in_wav.c
@@ -24,6 +24,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <string.h>
+#include <strings.h>
 #include "../log.h"
 #include <stdlib.h>
 
diff --git a/libsigrok/lib_main.c b/libsigrok/lib_main.c
index 3712108..c5834a9 100644
--- a/libsigrok/lib_main.c
+++ b/libsigrok/lib_main.c
@@ -82,6 +82,7 @@ static void make_demo_device_to_list();
 static void process_attach_event(int isEvent);
 static struct libusb_device* get_new_attached_usb_device();
 static struct libusb_device* get_new_detached_usb_device();
+extern SR_PRIV int sr_dslogic_option_value_to_code2(const struct sr_dev_inst *sdi, int config_id, const char *value);
 
 static struct sr_lib_context lib_ctx = {
 	.event_callback = NULL,
diff --git a/libsigrok/strutil.c b/libsigrok/strutil.c
index 837e4a0..97062b3 100644
--- a/libsigrok/strutil.c
+++ b/libsigrok/strutil.c
@@ -21,6 +21,7 @@
 #include "libsigrok-internal.h"
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <stdio.h>
 #include "log.h"