diff --git a/configure.ac b/configure.ac
index 11caa33..c6750e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -101,6 +101,7 @@ case $host_os in
 	;;
 	netbsd*)
 	AC_SEARCH_LIBS([prop_string_create], [prop])
+	AC_SEARCH_LIBS([_oss_ioctl], [ossaudio])
 	;;
 esac
 
diff --git a/src/print_cpu_usage.c b/src/print_cpu_usage.c
index 7de42f9..979e082 100644
--- a/src/print_cpu_usage.c
+++ b/src/print_cpu_usage.c
@@ -46,7 +46,9 @@ struct cpu_usage {
     int total;
 };
 
+#if defined(__linux__)
 static int cpu_count = 0;
+#endif
 static struct cpu_usage prev_all = {0, 0, 0, 0, 0};
 static struct cpu_usage *prev_cpus = NULL;
 static struct cpu_usage *curr_cpus = NULL;
diff --git a/src/print_mem.c b/src/print_mem.c
index 840f997..413067e 100644
--- a/src/print_mem.c
+++ b/src/print_mem.c
@@ -10,10 +10,14 @@
 #define BINARY_BASE UINT64_C(1024)
 
 #define MAX_EXPONENT 4
+
+#if defined(linux)
 static const char *const iec_symbols[MAX_EXPONENT + 1] = {"", "Ki", "Mi", "Gi", "Ti"};
 
 static const char memoryfile_linux[] = "/proc/meminfo";
+#endif
 
+#if defined(linux)
 /*
  * Prints the given amount of bytes in a human readable manner.
  *
@@ -28,7 +32,9 @@ static int print_bytes_human(char *outwalk, uint64_t bytes) {
     }
     return sprintf(outwalk, "%.1f %sB", size, iec_symbols[exponent]);
 }
+#endif
 
+#if defined(linux)
 /*
  * Convert a string to its absolute representation based on the total
  * memory of `mem_total`.
@@ -72,6 +78,7 @@ static long memory_absolute(const long mem_total, const char *size) {
 
     return mem_absolute;
 }
+#endif
 
 void print_memory(yajl_gen json_gen, char *buffer, const char *format, const char *format_degraded, const char *threshold_degraded, const char *threshold_critical, const char *memory_used_method) {
     char *outwalk = buffer;
diff --git a/src/print_volume.c b/src/print_volume.c
index 7364d47..575024a 100644
--- a/src/print_volume.c
+++ b/src/print_volume.c
@@ -15,13 +15,13 @@
 #include <math.h>
 #endif
 
-#if defined(__FreeBSD__) || defined(__DragonFly__)
+#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/soundcard.h>
 #endif
 
-#ifdef __OpenBSD__
+#if defined(__OpenBSD__)
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/audioio.h>
@@ -248,7 +248,7 @@ void print_volume(yajl_gen json_gen, char *buffer, const char *fmt, const char *
     snd_mixer_selem_id_free(sid);
 
 #endif
-#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
     char *mixerpath;
     char defaultmixer[] = "/dev/mixer";
     int mixfd, vol, devmask = 0;