diff --git a/lib/portability.c b/lib/portability.c
index abcecc803..e1a598148 100644
--- a/lib/portability.c
+++ b/lib/portability.c
@@ -54,7 +54,7 @@ void xgetrandom(void *buf, unsigned buflen)
 // Get list of mounted filesystems, including stat and statvfs info.
 // Returns a reversed list, which is good for finding overmounts and such.
 
-#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
 
 #include <sys/mount.h>
 
@@ -169,7 +169,7 @@ struct mtab_list *xgetmountlist(char *path)
 
 #endif
 
-#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
 
 #include <sys/event.h>
 
@@ -313,7 +313,7 @@ ssize_t xattr_fset(int fd, const char* name,
   return fsetxattr(fd, name, value, size, 0, flags);
 }
 
-#elif !defined(__FreeBSD__) && !defined(__OpenBSD__)
+#elif !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
 
 ssize_t xattr_get(const char *path, const char *name, void *value, size_t size)
 {
@@ -515,7 +515,7 @@ int dev_minor(int dev)
   return ((dev&0xfff00000)>>12)|(dev&0xff);
 #elif defined(__APPLE__)
   return dev&0xffffff;
-#elif defined(__FreeBSD__) || defined(__OpenBSD__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
   return minor(dev);
 #else
 #error
@@ -528,7 +528,7 @@ int dev_major(int dev)
   return (dev&0xfff00)>>8;
 #elif defined(__APPLE__)
   return (dev>>24)&0xff;
-#elif defined(__FreeBSD__) || defined(__OpenBSD__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
   return major(dev);
 #else
 #error
@@ -541,7 +541,7 @@ int dev_makedev(int major, int minor)
   return (minor&0xff)|((major&0xfff)<<8)|((minor&0xfff00)<<12);
 #elif defined(__APPLE__)
   return (minor&0xffffff)|((major&0xff)<<24);
-#elif defined(__FreeBSD__) || defined(__OpenBSD__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
   return makedev(major, minor);
 #else
 #error
@@ -550,7 +550,7 @@ int dev_makedev(int major, int minor)
 
 char *fs_type_name(struct statfs *statfs)
 {
-#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
   // macOS has an `f_type` field, but assigns values dynamically as filesystems
   // are registered. They do give you the name directly though, so use that.
   return statfs->f_fstypename;
@@ -644,6 +644,10 @@ static int check_copy_file_range(void)
 #endif
 }
 
+#ifdef __OpenBSD__
+#define syscall(...) -1
+#endif
+
 // Return bytes copied from in to out. If bytes <0 copy all of in to out.
 // If consumed isn't null, amount read saved there (return is written or error)
 long long sendfile_len(int in, int out, long long bytes, long long *consumed)
diff --git a/lib/portability.h b/lib/portability.h
index cb4725b81..ab84ceabd 100644
--- a/lib/portability.h
+++ b/lib/portability.h
@@ -145,7 +145,7 @@ void *memmem(const void *haystack, size_t haystack_length,
 #define bswap_32(x) OSSwapInt32(x)
 #define bswap_64(x) OSSwapInt64(x)
 
-#elif defined(__FreeBSD__) || defined(__OpenBSD__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__)  || defined(__NetBSD__)
 
 #include <sys/endian.h>
 
@@ -155,9 +155,15 @@ void *memmem(const void *haystack, size_t haystack_length,
 #define IS_BIG_ENDIAN 0
 #endif
 
+#ifdef __OpenBSD__
+#define bswap_16(x) swap16(x)
+#define bswap_32(x) swap32(x)
+#define bswap_64(x) swap64(x)
+#else
 #define bswap_16(x) bswap16(x)
 #define bswap_32(x) bswap32(x)
 #define bswap_64(x) bswap64(x)
+#endif
 
 #else
 
@@ -200,7 +206,7 @@ void *memmem(const void *haystack, size_t haystack_length,
 
 #ifdef __APPLE__
 #include <util.h>
-#elif !defined(__FreeBSD__) && !defined(__OpenBSD__)
+#elif !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
 #include <pty.h>
 #else
 #include <termios.h>
@@ -240,7 +246,12 @@ int posix_fallocate(int, off_t, off_t);
 #include <xlocale.h>
 #endif
 
-#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+#ifdef __NetBSD__
+#include <sys/statvfs.h>
+#define statfs statvfs
+#endif
+
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
 static inline long statfs_bsize(struct statfs *sf) { return sf->f_iosize; }
 static inline long statfs_frsize(struct statfs *sf) { return sf->f_bsize; }
 #else
diff --git a/main.c b/main.c
index 2cbaf1726..a6e32b6f2 100644
--- a/main.c
+++ b/main.c
@@ -151,6 +151,10 @@ void check_help(char **arg)
   }
 }
 
+#ifdef __NetBSD__
+#define uselocale(...) do {} while (0)
+#endif
+
 // Setup toybox global state for this command.
 void toy_singleinit(struct toy_list *which, char *argv[])
 {
diff --git a/scripts/make.sh b/scripts/make.sh
index ff677d5d4..e7174253b 100755
--- a/scripts/make.sh
+++ b/scripts/make.sh
@@ -236,8 +236,8 @@ if grep -qx 'CONFIG_TOYBOX_ZHELP=y' "$KCONFIG_CONFIG"
 then
   do_loudly $HOSTCC -I . scripts/install.c -o "$UNSTRIPPED"/instlist || exit 1
   { echo "#define ZHELP_LEN $("$UNSTRIPPED"/instlist --help | wc -c)" &&
-    "$UNSTRIPPED"/instlist --help | gzip -9 | od -Anone -vtx1 | \
-    sed 's/ /,0x/g;1s/^,/static char zhelp_data[] = {\n /;$s/.*/&};/'
+    "$UNSTRIPPED"/instlist --help | gzip -9 | $OD -An -vtx1 | \
+    $SED 's/  */,0x/g;1s/^,/static char zhelp_data[] = {\n /;$s/.*/&};/'
   } > "$GENDIR"/zhelp.h || exit 1
 else
   rm -f "$GENDIR"/zhelp.h
diff --git a/scripts/portability.sh b/scripts/portability.sh
index e8ad197a7..99ac04f69 100644
--- a/scripts/portability.sh
+++ b/scripts/portability.sh
@@ -8,6 +8,10 @@ then
   exit 1
 fi
 
+case ${OD-} in
+'') OD=$(command -v god || command -v ggod || echo od);; # use od from GNU coretutils
+esac
+
 if [ -z "$SED" ]
 then
   [ ! -z "$(command -v gsed 2>/dev/null)" ] && SED=gsed || SED=sed
@@ -19,7 +23,12 @@ then
   CFLAGS+=" -Wno-deprecated-declarations"
   : ${LDOPTIMIZE:=-Wl,-dead_strip} ${STRIP:=strip}
 else
-  : ${LDOPTIMIZE:=-Wl,--gc-sections -Wl,--as-needed} ${STRIP:=strip -s -R .note* -R .comment}
+  case "$(uname)" in
+  'NetBSD'|'OpenBSD') # don't strip .note.*bsd*
+    : ${LDOPTIMIZE:=-Wl,--gc-sections -Wl,--as-needed} ${STRIP:=strip -s -R .comment};;
+  *)
+    : ${LDOPTIMIZE:=-Wl,--gc-sections -Wl,--as-needed} ${STRIP:=strip -s -R .note* -R .comment};;
+  esac
 fi
 
 # Disable pointless warnings only clang produces
@@ -28,6 +37,11 @@ fi
 # And ones only gcc produces
   CFLAGS+=" -Wno-restrict -Wno-format-overflow"
 
+case "$(uname)" in
+'NetBSD'|'OpenBSD')
+  unset ASAN;;
+esac
+
 # Address Sanitizer
 if [ -n "$ASAN" ]; then
   # Turn ASan on and disable most optimization to get more readable backtraces.
diff --git a/tests/gunzip.test b/tests/gunzip.test
index bf9b9834a..b779576b0 100755
--- a/tests/gunzip.test
+++ b/tests/gunzip.test
@@ -51,7 +51,16 @@ echo "hello world" | gzip > f1.gz
 chmod 0411 f1.gz
 touch -a -t 197801020304 f1.gz
 touch -m -t 198704030201 f1.gz
-testing "permissions/times preservation" \
+case $(uname) in
+'FreeBSD'|'NetBSD'|'OpenBSD')
+  testing "permissions/times preservation" \
+    "gunzip -k f1.gz && stat -f '%p %a %m' f1 && stat -f '%p %m' f1.gz" \
+    "100411 252558240 544413660\n100411 544413660\n" "" ""
+  ;;
+*)
+  testing "permissions/times preservation" \
     "gunzip -k f1.gz && stat -c '%a %X %Y' f1 && stat -c '%a %Y' f1.gz" \
     "411 252558240 544413660\n411 544413660\n" "" ""
+  ;;
+esac
 rm -f f1 f1.gz
diff --git a/tests/gzip.test b/tests/gzip.test
index b458307e1..8a1bf9c37 100644
--- a/tests/gzip.test
+++ b/tests/gzip.test
@@ -72,9 +72,18 @@ echo "hello world" > f1
 chmod 0411 f1
 touch -a -t 197801020304 f1
 touch -m -t 198704030201 f1
-testing "permissions/times preservation" \
-    "gzip -k f1 && TZ=UTC stat -c '%a %Y' f1 && stat -c '%a %X %Y' f1.gz" \
-    "411 544413660\n411 252558240 544413660\n" "" ""
+case $(uname) in
+'FreeBSD'|'NetBSD'|'OpenBSD')
+  testing "permissions/times preservation" \
+    "gunzip -k f1.gz && stat -f '%p %a %m' f1 && stat -f '%p %m' f1.gz" \
+    "100411 252558240 544413660\n100411 544413660\n" "" ""
+  ;;
+*)
+  testing "permissions/times preservation" \
+    "gunzip -k f1.gz && stat -c '%a %X %Y' f1 && stat -c '%a %Y' f1.gz" \
+    "411 252558240 544413660\n411 544413660\n" "" ""
+  ;;
+esac
 rm -f f1 f1.gz
 
 testing "reject non-gzip" "gzip -dc $FILES/blkid/msdos.bz2 2>/dev/null ||
diff --git a/tests/printf.test b/tests/printf.test
index 57f2a2839..6580e5e0f 100755
--- a/tests/printf.test
+++ b/tests/printf.test
@@ -7,6 +7,9 @@
 
 #testing "name" "command" "result" "infile" "stdin"
 
+[ -z "$OD" ] && \
+  OD=$(command -v god || command -v ggod || echo od) # use od from GNU coretutils
+
 # Note: must use "testcmd" not "testing" else it's testing the shell builtin.
 
 testcmd "text" "TEXT" "TEXT" "" ""
@@ -19,11 +22,11 @@ testcmd "escapes" "'one\ntwo\n\v\t\r\f\e\b\athree'" \
 testcmd "%b escapes" "%b 'one\ntwo\n\v\t\r\f\e\b\athree'" \
   "one\ntwo\n\v\t\r\f\x1b\b\athree" "" ""
 
-testcmd "null" "'x\0y' | od -An -tx1" ' 78 00 79\n' "" ""
+testcmd "null" "'x\0y' | $OD -An -tx1" ' 78 00 79\n' "" ""
 testcmd "trailing slash" "'abc\'" 'abc\' "" ""
 testcmd "octal" "' \1\002\429\045x'" ' \001\002"9%x' "" ""
 testcmd "not octal" "'\9'" '\9' "" ""
-testcmd "hex" "'A\x1b\x2B\x3Q\xa' | od -An -tx1" ' 41 1b 2b 03 51 0a\n' "" ""
+testcmd "hex" "'A\x1b\x2B\x3Q\xa' | $OD -An -tx1" ' 41 1b 2b 03 51 0a\n' "" ""
 testcmd "%x" "'%x\n' 0x2a" "2a\n" "" ""
 
 testcmd "%d 42" "%d 42" "42" "" ""
@@ -67,7 +70,7 @@ testcmd "corner case" "'\\8'" '\8' '' ''
 # so treating the \0066 in %b like the \0066 not in %b is wrong because posix.
 testcmd "posix inconsistency" "'\\0066-%b' '\\0066'" "\x066-6" "" ""
 
-testcmd '\x' "'A\x1b\x2B\x3Q\xa' | od -An -tx1" " 41 1b 2b 03 51 0a\n" \
+testcmd '\x' "'A\x1b\x2B\x3Q\xa' | $OD -An -tx1" " 41 1b 2b 03 51 0a\n" \
   "" ""
 
 testcmd '\c' "'one\ctwo'" "one" "" ""
diff --git a/tests/zcat.test b/tests/zcat.test
index 878a11d44..9723f7939 100755
--- a/tests/zcat.test
+++ b/tests/zcat.test
@@ -4,6 +4,8 @@
 
 #testing "name" "command" "result" "infile" "stdin"
 
+HEAD=$(command -v ghead || echo head) # use head from GNU coreutils
+
 echo -n "hi " | gzip > 1.gz
 echo "there" | gzip > 2.gz
 
@@ -12,7 +14,7 @@ testcmd "files" "1.gz 2.gz && test -f 1.gz && test -f 2.gz" "hi there\n" "" ""
 # zcat -c is allowed but changes nothing
 testcmd "-c" "-c 1.gz 2.gz && test -f 1.gz && test -f 2.gz" "hi there\n" "" ""
 testing "concatenated" "{ cat 1.gz 2.gz; } | zcat" "hi there\n" "" ""
-testing "error" "head -c 10 2.gz | { zcat 2>/dev/null || echo fail; }" "fail\n"\
+testing "error" "$HEAD -c 10 2.gz | { zcat 2>/dev/null || echo fail; }" "fail\n"\
   "" ""
 
 # TODO: how to test "zcat -f"?