diff --git a/libc/arch-arm/include/machine/elf_machdep.h b/libc/arch-arm/include/machine/elf_machdep.h
index 40e0a5a..3496b28 100644
--- a/libc/arch-arm/include/machine/elf_machdep.h
+++ b/libc/arch-arm/include/machine/elf_machdep.h
@@ -3,11 +3,7 @@
 #ifndef _ARM_ELF_MACHDEP_H_
 #define _ARM_ELF_MACHDEP_H_
 
-#if defined(__ARMEB__)
-#define ELF32_MACHDEP_ENDIANNESS	ELFDATA2MSB
-#else
 #define ELF32_MACHDEP_ENDIANNESS	ELFDATA2LSB
-#endif
 
 #define ELF64_MACHDEP_ENDIANNESS	XXX	/* break compilation */
 #define ELF64_MACHDEP_ID_CASES                                          \
diff --git a/libc/arch-mips/include/machine/asm.h b/libc/arch-mips/include/machine/asm.h
index cdc7914..74412c1 100644
--- a/libc/arch-mips/include/machine/asm.h
+++ b/libc/arch-mips/include/machine/asm.h
@@ -53,13 +53,9 @@
 	ABICALLS
 #endif
 
-#if !defined(__MIPSEL__) && !defined(__MIPSEB__)
-#error "__MIPSEL__ or __MIPSEB__ must be defined"
-#endif
 /*
  * Define how to access unaligned data word
  */
-#if defined(__MIPSEL__)
 #define LWLO    lwl
 #define LWHI    lwr
 #define	SWLO	swl
@@ -68,17 +64,6 @@
 #define LDHI    ldr
 #define	SDLO	sdl
 #define	SDHI	sdr
-#endif
-#if defined(__MIPSEB__)
-#define LWLO    lwr
-#define LWHI    lwl
-#define	SWLO	swr
-#define	SWHI	swl
-#define LDLO    ldr
-#define LDHI    ldl
-#define	SDLO	sdr
-#define	SDHI	sdl
-#endif
 
 /*
  *  Define programming environment for ABI.
diff --git a/libc/arch-mips/include/machine/elf_machdep.h b/libc/arch-mips/include/machine/elf_machdep.h
index 516a44f..b6117f2 100644
--- a/libc/arch-mips/include/machine/elf_machdep.h
+++ b/libc/arch-mips/include/machine/elf_machdep.h
@@ -151,14 +151,7 @@
 #define	EF_MIPS_ABI_EABI32	0x00003000
 #define	EF_MIPS_ABI_EABI64	0x00004000
 
-#if defined(__MIPSEB__)
-#define	ELF32_MACHDEP_ENDIANNESS	ELFDATA2MSB
-#define	ELF64_MACHDEP_ENDIANNESS	ELFDATA2MSB
-#elif defined(__MIPSEL__)
 #define	ELF32_MACHDEP_ENDIANNESS	ELFDATA2LSB
 #define	ELF64_MACHDEP_ENDIANNESS	ELFDATA2LSB
-#elif !defined(HAVE_NBTOOL_CONFIG_H)
-#error neither __MIPSEL__ nor __MIPSEB__ are defined.
-#endif
 
 #endif /* _MIPS_ELF_MACHDEP_H_ */
diff --git a/libc/include/arpa/nameser_compat.h b/libc/include/arpa/nameser_compat.h
index 6868876..e4e9335 100644
--- a/libc/include/arpa/nameser_compat.h
+++ b/libc/include/arpa/nameser_compat.h
@@ -54,21 +54,6 @@
 
 typedef struct {
 	unsigned	id :16;		/* query identification number */
-#if BYTE_ORDER == BIG_ENDIAN
-			/* fields in third byte */
-	unsigned	qr: 1;		/* response flag */
-	unsigned	opcode: 4;	/* purpose of message */
-	unsigned	aa: 1;		/* authoritive answer */
-	unsigned	tc: 1;		/* truncated message */
-	unsigned	rd: 1;		/* recursion desired */
-			/* fields in fourth byte */
-	unsigned	ra: 1;		/* recursion available */
-	unsigned	unused :1;	/* unused bits (MBZ as of 4.9.3a3) */
-	unsigned	ad: 1;		/* authentic data from named */
-	unsigned	cd: 1;		/* checking disabled by resolver */
-	unsigned	rcode :4;	/* response code */
-#endif
-#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
 			/* fields in third byte */
 	unsigned	rd :1;		/* recursion desired */
 	unsigned	tc :1;		/* truncated message */
@@ -81,7 +66,6 @@
 	unsigned	ad: 1;		/* authentic data from named */
 	unsigned	unused :1;	/* unused bits (MBZ as of 4.9.3a3) */
 	unsigned	ra :1;		/* recursion available */
-#endif
 			/* remaining bytes */
 	unsigned	qdcount :16;	/* number of question entries */
 	unsigned	ancount :16;	/* number of answer entries */
diff --git a/libc/include/netinet/icmp6.h b/libc/include/netinet/icmp6.h
index eca7b45..43ec521 100644
--- a/libc/include/netinet/icmp6.h
+++ b/libc/include/netinet/icmp6.h
@@ -245,17 +245,9 @@
 #define nd_na_code		nd_na_hdr.icmp6_code
 #define nd_na_cksum		nd_na_hdr.icmp6_cksum
 #define nd_na_flags_reserved	nd_na_hdr.icmp6_data32[0]
-#if BYTE_ORDER == BIG_ENDIAN
-#define ND_NA_FLAG_ROUTER		0x80000000
-#define ND_NA_FLAG_SOLICITED		0x40000000
-#define ND_NA_FLAG_OVERRIDE		0x20000000
-#else
-#if BYTE_ORDER == LITTLE_ENDIAN
 #define ND_NA_FLAG_ROUTER		0x80
 #define ND_NA_FLAG_SOLICITED		0x40
 #define ND_NA_FLAG_OVERRIDE		0x20
-#endif
-#endif
 
 struct nd_redirect {		/* redirect */
 	struct icmp6_hdr	nd_rd_hdr;
@@ -384,40 +376,17 @@
 #define NI_QTYPE_NODEADDR	3 /* Node Addresses */
 #define NI_QTYPE_IPV4ADDR	4 /* IPv4 Addresses */
 
-#if BYTE_ORDER == BIG_ENDIAN
-#define NI_SUPTYPE_FLAG_COMPRESS	0x1
-#define NI_FQDN_FLAG_VALIDTTL		0x1
-#elif BYTE_ORDER == LITTLE_ENDIAN
 #define NI_SUPTYPE_FLAG_COMPRESS	0x0100
 #define NI_FQDN_FLAG_VALIDTTL		0x0100
-#endif
 
 #ifdef NAME_LOOKUPS_04
-#if BYTE_ORDER == BIG_ENDIAN
-#define NI_NODEADDR_FLAG_LINKLOCAL	0x1
-#define NI_NODEADDR_FLAG_SITELOCAL	0x2
-#define NI_NODEADDR_FLAG_GLOBAL		0x4
-#define NI_NODEADDR_FLAG_ALL		0x8
-#define NI_NODEADDR_FLAG_TRUNCATE	0x10
-#define NI_NODEADDR_FLAG_ANYCAST	0x20 /* just experimental. not in spec */
-#elif BYTE_ORDER == LITTLE_ENDIAN
 #define NI_NODEADDR_FLAG_LINKLOCAL	0x0100
 #define NI_NODEADDR_FLAG_SITELOCAL	0x0200
 #define NI_NODEADDR_FLAG_GLOBAL		0x0400
 #define NI_NODEADDR_FLAG_ALL		0x0800
 #define NI_NODEADDR_FLAG_TRUNCATE	0x1000
 #define NI_NODEADDR_FLAG_ANYCAST	0x2000 /* just experimental. not in spec */
-#endif
 #else  /* draft-ietf-ipngwg-icmp-name-lookups-05 (and later?) */
-#if BYTE_ORDER == BIG_ENDIAN
-#define NI_NODEADDR_FLAG_TRUNCATE	0x1
-#define NI_NODEADDR_FLAG_ALL		0x2
-#define NI_NODEADDR_FLAG_COMPAT		0x4
-#define NI_NODEADDR_FLAG_LINKLOCAL	0x8
-#define NI_NODEADDR_FLAG_SITELOCAL	0x10
-#define NI_NODEADDR_FLAG_GLOBAL		0x20
-#define NI_NODEADDR_FLAG_ANYCAST	0x40 /* just experimental. not in spec */
-#elif BYTE_ORDER == LITTLE_ENDIAN
 #define NI_NODEADDR_FLAG_TRUNCATE	0x0100
 #define NI_NODEADDR_FLAG_ALL		0x0200
 #define NI_NODEADDR_FLAG_COMPAT		0x0400
@@ -426,7 +395,6 @@
 #define NI_NODEADDR_FLAG_GLOBAL		0x2000
 #define NI_NODEADDR_FLAG_ANYCAST	0x4000 /* just experimental. not in spec */
 #endif
-#endif
 
 struct ni_reply_fqdn {
 	u_int32_t ni_fqdn_ttl;	/* TTL */
@@ -485,13 +453,8 @@
 #define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK	0x80
 #define ICMP6_RR_PCOUSE_RAFLAGS_AUTO	0x40
 
-#if BYTE_ORDER == BIG_ENDIAN
-#define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     0x80000000
-#define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     0x40000000
-#elif BYTE_ORDER == LITTLE_ENDIAN
 #define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     0x80
 #define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     0x40
-#endif
 
 struct rr_result {		/* router renumbering result message */
 	u_int16_t	rrr_flags;
@@ -500,13 +463,8 @@
 	u_int32_t	rrr_ifid;
 	struct	in6_addr rrr_prefix;
 } __packed;
-#if BYTE_ORDER == BIG_ENDIAN
-#define ICMP6_RR_RESULT_FLAGS_OOB		0x0002
-#define ICMP6_RR_RESULT_FLAGS_FORBIDDEN		0x0001
-#elif BYTE_ORDER == LITTLE_ENDIAN
 #define ICMP6_RR_RESULT_FLAGS_OOB		0x0200
 #define ICMP6_RR_RESULT_FLAGS_FORBIDDEN		0x0100
-#endif
 
 /*
  * icmp6 filter structures.
diff --git a/libc/include/netinet/ip.h b/libc/include/netinet/ip.h
index 629ed77..4821933 100644
--- a/libc/include/netinet/ip.h
+++ b/libc/include/netinet/ip.h
@@ -53,14 +53,8 @@
  * Structure of an internet header, naked of options.
  */
 struct ip {
-#if BYTE_ORDER == LITTLE_ENDIAN
 	u_int32_t ip_hl:4,		/* header length */
 		  ip_v:4;		/* version */
-#endif
-#if BYTE_ORDER == BIG_ENDIAN
-	u_int32_t ip_v:4,		/* version */
-		  ip_hl:4;		/* header length */
-#endif
 	u_int8_t  ip_tos;		/* type of service */
 	u_int16_t ip_len;		/* total length */
 	u_int16_t ip_id;		/* identification */
@@ -149,14 +143,8 @@
 	u_int8_t ipt_code;		/* IPOPT_TS */
 	u_int8_t ipt_len;		/* size of structure (variable) */
 	u_int8_t ipt_ptr;		/* index of current entry */
-#if _BYTE_ORDER == _LITTLE_ENDIAN
 	u_int32_t ipt_flg:4,		/* flags, see below */
 		  ipt_oflw:4;		/* overflow counter */
-#endif
-#if _BYTE_ORDER == _BIG_ENDIAN
-	u_int32_t ipt_oflw:4,		/* overflow counter */
-		  ipt_flg:4;		/* flags, see below */
-#endif
 	union ipt_timestamp {
 	n_time	ipt_time[1];
 	struct	ipt_ta {
diff --git a/libc/include/netinet/ip6.h b/libc/include/netinet/ip6.h
index fcfd5d6..b4f6ce6 100644
--- a/libc/include/netinet/ip6.h
+++ b/libc/include/netinet/ip6.h
@@ -99,15 +99,9 @@
 #define IPV6_VERSION		0x60
 #define IPV6_VERSION_MASK	0xf0
 
-#if BYTE_ORDER == BIG_ENDIAN
-#define IPV6_FLOWINFO_MASK	0x0fffffff	/* flow info (28 bits) */
-#define IPV6_FLOWLABEL_MASK	0x000fffff	/* flow label (20 bits) */
-#else
-#if BYTE_ORDER == LITTLE_ENDIAN
 #define IPV6_FLOWINFO_MASK	0xffffff0f	/* flow info (28 bits) */
 #define IPV6_FLOWLABEL_MASK	0xffff0f00	/* flow label (20 bits) */
-#endif /* LITTLE_ENDIAN */
-#endif
+
 #if 1
 /* ECN bits proposed by Sally Floyd */
 #define IP6TOS_CE		0x01	/* congestion experienced */
@@ -200,17 +194,9 @@
 	u_int8_t ip6or_value[2];
 } __packed;
 /* Router alert values (in network byte order) */
-#if BYTE_ORDER == BIG_ENDIAN
-#define IP6_ALERT_MLD	0x0000
-#define IP6_ALERT_RSVP	0x0001
-#define IP6_ALERT_AN	0x0002
-#else
-#if BYTE_ORDER == LITTLE_ENDIAN
 #define IP6_ALERT_MLD	0x0000
 #define IP6_ALERT_RSVP	0x0100
 #define IP6_ALERT_AN	0x0200
-#endif /* LITTLE_ENDIAN */
-#endif
 
 /* Routing header */
 struct ip6_rthdr {
@@ -238,15 +224,9 @@
 	u_int32_t ip6f_ident;		/* identification */
 } __packed;
 
-#if BYTE_ORDER == BIG_ENDIAN
-#define IP6F_OFF_MASK		0xfff8	/* mask out offset from _offlg */
-#define IP6F_RESERVED_MASK	0x0006	/* reserved bits in ip6f_offlg */
-#define IP6F_MORE_FRAG		0x0001	/* more-fragments flag */
-#else /* BYTE_ORDER == LITTLE_ENDIAN */
 #define IP6F_OFF_MASK		0xf8ff	/* mask out offset from _offlg */
 #define IP6F_RESERVED_MASK	0x0600	/* reserved bits in ip6f_offlg */
 #define IP6F_MORE_FRAG		0x0100	/* more-fragments flag */
-#endif /* BYTE_ORDER == LITTLE_ENDIAN */
 
 /*
  * Internet implementation parameters.