diff --git a/Makefile b/Makefile
index acaad3e..ab8f791 100644
--- a/Makefile
+++ b/Makefile
@@ -373,6 +373,9 @@
 ifeq (${FIRMWARE_ARCH},)
 INCLUDES += -Ihost/include -Ihost/lib/include
 INCLUDES += -Ihost/lib21/include
+ifeq ($(shell uname -s), OpenBSD)
+INCLUDES += -I/usr/local/include
+endif
 endif
 
 # Firmware library, used by the other firmware components (depthcharge,
@@ -963,6 +966,8 @@
 
 # on FreeBSD: install misc/e2fsprogs-libuuid from ports,
 # or e2fsprogs-libuuid from its binary package system.
+# on OpenBSD: install sysutils/e2fsprogs from ports,
+# or e2fsprogs from its binary package system, to install uuid/uid.h
 ${CGPT}: LDLIBS += -luuid
 
 ${CGPT}: ${CGPT_OBJS} ${UTILLIB}
@@ -1138,6 +1143,9 @@
 ifeq ($(shell uname -s), FreeBSD)
 CRYPTO_LIBS += -lcrypto
 endif
+ifeq ($(shell uname -s), OpenBSD)
+LDFLAGS += -Wl,-z,notext
+endif
 
 ${BUILD}/utility/dumpRSAPublicKey: LDLIBS += ${CRYPTO_LIBS}
 ${BUILD}/utility/pad_digest_utility: LDLIBS += ${CRYPTO_LIBS}
diff --git a/cgpt/cgpt.h b/cgpt/cgpt.h
index 0747b5c..89c357e 100644
--- a/cgpt/cgpt.h
+++ b/cgpt/cgpt.h
@@ -7,7 +7,7 @@
 #define VBOOT_REFERENCE_CGPT_H_
 
 #include <fcntl.h>
-#if !defined(HAVE_MACOS) && !defined(__FreeBSD__)
+#if !defined(HAVE_MACOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 #include <features.h>
 #endif
 #include <stdint.h>
diff --git a/cgpt/cgpt_common.c b/cgpt/cgpt_common.c
index 426be3b..c3edd0f 100644
--- a/cgpt/cgpt_common.c
+++ b/cgpt/cgpt_common.c
@@ -9,7 +9,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
-#if !defined(HAVE_MACOS) && !defined(__FreeBSD__)
+#if !defined(HAVE_MACOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 #include <linux/major.h>
 #include <mtd/mtd-user.h>
 #endif
@@ -295,7 +295,7 @@
   if (fstat(fd, &stat) == -1) {
     return -1;
   }
-#if !defined(HAVE_MACOS) && !defined(__FreeBSD__)
+#if !defined(HAVE_MACOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
   if ((stat.st_mode & S_IFMT) != S_IFREG) {
     if (ioctl(fd, BLKGETSIZE64, size) < 0) {
       return -1;
@@ -325,7 +325,7 @@
   memset(drive, 0, sizeof(struct drive));
 
   drive->fd = open(drive_path, mode |
-#if !defined(HAVE_MACOS) && !defined(__FreeBSD__)
+#if !defined(HAVE_MACOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 		               O_LARGEFILE |
 #endif
 			       O_NOFOLLOW);
diff --git a/futility/cmd_vbutil_kernel.c b/futility/cmd_vbutil_kernel.c
index 83a76f8..27cbb9b 100644
--- a/futility/cmd_vbutil_kernel.c
+++ b/futility/cmd_vbutil_kernel.c
@@ -9,7 +9,7 @@
 #include <fcntl.h>
 #include <getopt.h>
 #include <inttypes.h>		/* For PRIu64 */
-#if !defined(HAVE_MACOS) && !defined(__FreeBSD__)
+#if !defined(HAVE_MACOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 #include <linux/fs.h>		/* For BLKGETSIZE64 */
 #endif
 #include <stdarg.h>
@@ -173,7 +173,7 @@
 		FATAL("Unable to stat %s: %s\n", filename, strerror(errno));
 
 	if (S_ISBLK(statbuf.st_mode)) {
-#if !defined(HAVE_MACOS) && !defined(__FreeBSD__)
+#if !defined(HAVE_MACOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 		int fd = open(filename, O_RDONLY);
 		if (fd >= 0) {
 			ioctl(fd, BLKGETSIZE64, &file_size);
diff --git a/futility/dump_kernel_config_lib.c b/futility/dump_kernel_config_lib.c
index 4240e5e..ff39c41 100644
--- a/futility/dump_kernel_config_lib.c
+++ b/futility/dump_kernel_config_lib.c
@@ -10,7 +10,7 @@
 #include <string.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
-#if !defined (__FreeBSD__)
+#if !defined (__FreeBSD__) && !defined(__OpenBSD__)
 #include <sys/sysmacros.h>
 #endif
 #include <sys/types.h>
@@ -125,7 +125,7 @@
 	char *newstr = NULL;
 
 	int fd = open(infile, O_RDONLY | O_CLOEXEC
-#if !defined(__FreeBSD__)
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
 			| O_LARGEFILE
 #endif
 			);
diff --git a/futility/misc.c b/futility/misc.c
index 0c8a0e7..f3e7748 100644
--- a/futility/misc.c
+++ b/futility/misc.c
@@ -5,7 +5,7 @@
 
 #include <assert.h>
 #include <errno.h>
-#if !defined(HAVE_MACOS) && !defined(__FreeBSD__)
+#if !defined(HAVE_MACOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 #include <linux/fs.h>		/* For BLKGETSIZE64 */
 #endif
 #include <stdarg.h>
@@ -272,7 +272,7 @@
 		return FILE_ERR_STAT;
 	}
 
-#if !defined(HAVE_MACOS) && !defined(__FreeBSD__)
+#if !defined(HAVE_MACOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 	if (S_ISBLK(sb.st_mode))
 		ioctl(fd, BLKGETSIZE64, &sb.st_size);
 #endif
diff --git a/futility/updater_archive.c b/futility/updater_archive.c
index 218499e..70d8bb3 100644
--- a/futility/updater_archive.c
+++ b/futility/updater_archive.c
@@ -8,6 +8,9 @@
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
+#if defined(__OpenBSD__)
+#include <sys/types.h>
+#endif
 #include <fts.h>
 #include <string.h>
 #include <stdio.h>
diff --git a/futility/updater_utils.c b/futility/updater_utils.c
index 1c626bc..70ed396 100644
--- a/futility/updater_utils.c
+++ b/futility/updater_utils.c
@@ -10,7 +10,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
-#if defined (__FreeBSD__)
+#if defined (__FreeBSD__) || defined(__OpenBSD__)
 #include <sys/wait.h>
 #endif
 
diff --git a/host/arch/x86/lib/crossystem_arch.c b/host/arch/x86/lib/crossystem_arch.c
index 6a8f5a2..e805e2a 100644
--- a/host/arch/x86/lib/crossystem_arch.c
+++ b/host/arch/x86/lib/crossystem_arch.c
@@ -7,7 +7,7 @@
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
-#if !defined(__FreeBSD__)
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
 #include <linux/nvram.h>
 #include <linux/version.h>
 #endif
@@ -100,7 +100,7 @@
 
 static void VbFixCmosChecksum(FILE* file)
 {
-#if !defined(__FreeBSD__)
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
 	int fd = fileno(file);
 	ioctl(fd, NVRAM_SETCKS);
 #endif
@@ -666,7 +666,7 @@
 
 	if (uname(&host) == 0) {
 		if (sscanf(host.release, "%u.%u.", &maj, &min) == 2) {
-#if !defined(__FreeBSD__)
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
 			if (KERNEL_VERSION(maj, min, 0) >= KERNEL_VERSION(4, 16, 0) &&
 			    *offset > 11)
 				*offset += 3;