diff --git a/lib/elf/eheader.h b/lib/elf/eheader.h
new file mode 100644
index 0000000..5b45703
--- /dev/null
+++ b/lib/elf/eheader.h
@@ -0,0 +1,71 @@
+/* The ELF header resides at the beginning of an ELF file.
+ * It identifies the file as an ELF file and contains the information
+ * necessary for interpreting the contents of the file and locating
+ * the other components of the file.
+ * REF: https://gabi.xinuos.com/elf/02-eheader.html#elf-header
+ */
+#ifndef BFPG_ELF_HEADER_H
+# define BFPG_ELF_HEADER_H
+
+# include "eint.h"
+
+# define EI_NIDENT (16)
+
+typedef struct {
+  unsigned char e_ident[EI_NIDENT];
+  Elf32_Half    e_type;
+  Elf32_Half    e_machine;
+  Elf32_Word    e_version;
+  Elf32_Addr    e_entry;
+  Elf32_Off     e_phoff;
+  Elf32_Off     e_shoff;
+  Elf32_Word    e_flags;
+  Elf32_Half    e_ehsize;
+  Elf32_Half    e_phentsize;
+  Elf32_Half    e_phnum;
+  Elf32_Half    e_shentsize;
+  Elf32_Half    e_shnum;
+  Elf32_Half    e_shstrndx;
+} Elf32_Ehdr;
+
+typedef struct {
+  unsigned char e_ident[EI_NIDENT];
+  Elf64_Half    e_type;
+  Elf64_Half    e_machine;
+  Elf64_Word    e_version;
+  Elf64_Addr    e_entry;
+  Elf64_Off     e_phoff;
+  Elf64_Off     e_shoff;
+  Elf64_Word    e_flags;
+  Elf64_Half    e_ehsize;
+  Elf64_Half    e_phentsize;
+  Elf64_Half    e_phnum;
+  Elf64_Half    e_shentsize;
+  Elf64_Half    e_shnum;
+  Elf64_Half    e_shstrndx;
+} Elf64_Ehdr;
+
+/* == ElfXX_Ehdr.e_ident[] ==
+ * EI_* macros define indexes into this this, and are followed
+ * by a series a macros defining legal values for that index.
+ */
+# define E_IDENT_DESC (                                             \
+  "The initial bytes of an ELF file. Marking it as an object file " \
+  "and providing machine-independent data with which to decode "    \
+  "and interpret the file’s contents."
+
+/* == ElfXX_Ehdr.e_type == */
+enum e_type_t : Elf64_Addr {
+  ET_NONE   = 0,      /* No file type              */
+  ET_REL    = 1,      /* Relocatable file          */
+  ET_EXEC   = 2,      /* Executable file           */
+  ET_DYN    = 3,      /* Shared object file        */
+  ET_CORE   = 4,      /* Core file                 */
+  ET_LOOS   = 0xfe00, /* OS-specific range start  */
+  ET_HIOS   = 0xfeff, /* OS-specific range end    */
+  ET_LOPROC = 0xff00, /* Processor-specific range start */
+  ET_HIPROC = 0xffff, /* Processor-specific range end   */
+};
+
+
+#endif /* BFPG_ELF_HEADER_H */