diff --git a/configure.ac b/configure.ac
index cb9c7a3..b5aa34b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -106,6 +106,7 @@ AM_CONDITIONAL([IRDA], [test "$irda_win32" = "yes" || test "$irda_linux" = "yes"
 AC_CHECK_HEADERS([linux/serial.h])
 AC_CHECK_HEADERS([IOKit/serial/ioss.h])
 AC_CHECK_HEADERS([getopt.h])
+AC_CHECK_HEADERS([sys/param.h])
 
 # Checks for global variable declarations.
 AC_CHECK_DECLS([optreset])
diff --git a/examples/dctool.c b/examples/dctool.c
index c3ac6c0..a317980 100644
--- a/examples/dctool.c
+++ b/examples/dctool.c
@@ -31,6 +31,9 @@
 #ifdef HAVE_GETOPT_H
 #include <getopt.h>
 #endif
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
 
 #include <libdivecomputer/context.h>
 #include <libdivecomputer/descriptor.h>
@@ -40,13 +43,17 @@
 #include "utils.h"
 
 #if defined(__GLIBC__) || defined(__MINGW32__)
-#define NOPERMUTATION "+"
 #define RESET 0
 #else
-#define NOPERMUTATION ""
 #define RESET 1
 #endif
 
+#if defined(__GLIBC__) || defined(__MINGW32__) || defined(BSD)
+#define NOPERMUTATION "+"
+#else
+#define NOPERMUTATION ""
+#endif
+
 static const dctool_command_t *g_commands[] = {
 	&dctool_help,
 	&dctool_version,