diff --git a/libs/ardour/plugin_manager.cc b/libs/ardour/plugin_manager.cc
index 4600f984dc..514396a7ab 100644
--- a/libs/ardour/plugin_manager.cc
+++ b/libs/ardour/plugin_manager.cc
@@ -118,8 +118,9 @@
 #include <Carbon/Carbon.h>
 #endif
 
-#ifdef VST3_SUPPORT
 #include "ardour/system_exec.h"
+
+#ifdef VST3_SUPPORT
 #include "ardour/vst3_module.h"
 #include "ardour/vst3_plugin.h"
 #include "ardour/vst3_scan.h"
diff --git a/libs/backends/jack/jack_utils.cc b/libs/backends/jack/jack_utils.cc
index 7ef20913c6..414a6969ef 100644
--- a/libs/backends/jack/jack_utils.cc
+++ b/libs/backends/jack/jack_utils.cc
@@ -119,9 +119,10 @@ ARDOUR::get_jack_audio_driver_names (vector<string>& audio_driver_names)
 #ifdef HAVE_ALSA
 	audio_driver_names.push_back (alsa_driver_name);
 #endif
-	audio_driver_names.push_back (oss_driver_name);
-#if defined(__NetBSD__) || defined(__sun)
+#if defined(__NetBSD__)
 	audio_driver_names.push_back (sun_driver_name);
+#else
+	audio_driver_names.push_back (oss_driver_name);
 #endif
 	audio_driver_names.push_back (freebob_driver_name);
 	audio_driver_names.push_back (ffado_driver_name);
@@ -506,7 +507,7 @@ bool
 ARDOUR::get_jack_audio_driver_supports_setting_period_count (const string& driver)
 {
 	return !(driver == dummy_driver_name || driver == coreaudio_driver_name ||
-			driver == portaudio_driver_name);
+			driver == portaudio_driver_name || driver == sun_driver_name);
 }
 
 bool
@@ -687,7 +688,7 @@ ARDOUR::get_jack_command_line_string (JackCommandLineOptions& options, string& c
 
 	args.push_back (options.server_path);
 
-#ifdef PLATFORM_WINDOWS
+#if defined(PLATFORM_WINDOWS) || defined(__NetBSD__) || defined(__sun)
 	// must use sync mode on windows
 	args.push_back ("-S");
 #endif
@@ -717,6 +718,7 @@ ARDOUR::get_jack_command_line_string (JackCommandLineOptions& options, string& c
 	args.push_back ("-p");
 	args.push_back (to_string(options.ports_max));
 
+#ifndef __NetBSD__
 	if (options.realtime) {
 		args.push_back ("-R");
 		if (options.priority != 0) {
@@ -726,6 +728,9 @@ ARDOUR::get_jack_command_line_string (JackCommandLineOptions& options, string& c
 	} else {
 		args.push_back ("-r");
 	}
+#else
+	args.push_back ("-r");
+#endif
 
 	if (options.unlock_gui_libs) {
 		args.push_back ("-u");
diff --git a/libs/pbd/cpus.cc b/libs/pbd/cpus.cc
index faf768d4af..d538697425 100644
--- a/libs/pbd/cpus.cc
+++ b/libs/pbd/cpus.cc
@@ -25,7 +25,7 @@
 
 #ifdef __linux__
 #include <unistd.h>
-#elif defined(__APPLE__) || defined(__FreeBSD__)
+#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
 #include <stddef.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
diff --git a/libs/tk/ydk/config.h b/libs/tk/ydk/config.h
index 229b61be71..ba4b54730d 100644
--- a/libs/tk/ydk/config.h
+++ b/libs/tk/ydk/config.h
@@ -27,7 +27,7 @@
 #define HAVE_GETRESUID 1
 #endif
 
-#ifndef __APPLE__
+#if !defined(__APPLE__) && !defined(__NetBSD__)
 /* Have GNU ftw */
 #define HAVE_GNU_FTW 1
 #endif
diff --git a/libs/tk/ytk/config.h b/libs/tk/ytk/config.h
index 5a04482361..d913bc1ee3 100644
--- a/libs/tk/ytk/config.h
+++ b/libs/tk/ytk/config.h
@@ -24,11 +24,11 @@
 #endif
 
 /* Define to 1 if you have the `getresuid' function. */
-#if !(defined PLATFORM_WINDOWS || defined __APPLE__)
+#if !(defined PLATFORM_WINDOWS || defined __APPLE__ || defined(__NetBSD__))
 #define HAVE_GETRESUID 1
 #endif
 
-#ifndef __APPLE__
+#if !defined(__APPLE__) && !defined(__NetBSD__)
 /* Have GNU ftw */
 #define HAVE_GNU_FTW 1
 #endif