Compile with older glibc, thanks to Bringfried Stecklum

Makefile

@@ -9,7 +9,7 @@ ifeq ($(CC),gcc)
 endif
 endif
 OPT = -g -O0
-CFLAGS = $(patsubst %,-I%/include,$(LIBPREFIX)) $(OPT) -std=c99 \
+CFLAGS = $(patsubst %,-I%/include,$(LIBPREFIX)) $(OPT) -std=gnu99 \
 	-Wall -Wno-unknown-pragmas
     LDFLAGS = $(patsubst %,-L%/lib,$(LIBPREFIX)) $(OPT) -Wall
 

endian.c

@@ -15,14 +15,14 @@ void xle64enc(uint8_t *d, uint64_t n) {
 
 #define _BSD_SOURCE
 #include <stdint.h>
-#include <endian.h>
+#include <asm/byteorder.h>
 
 uint64_t xle64dec(const uint8_t *d) {
-    return le64toh(*(uint64_t*)d);
+    return __le64_to_cpu(*(uint64_t*)d);
 }
 
 void xle64enc(uint8_t *d, uint64_t n) {
-    *(uint64_t*)d = htole64(n);
+    *(uint64_t*)d = __cpu_to_le64(n);
 }