diff --git a/src/libmach/macho.h b/src/libmach/macho.h
new file mode 100644
index 0000000..377e0d2
--- /dev/null
+++ b/src/libmach/macho.h
@@ -0,0 +1,71 @@
+typedef struct Macho Macho;
+typedef struct MachoCmd MachoCmd;
+
+enum
+{
+	MachoCpuVax = 1,
+	MachoCpu68000 = 6,
+	MachoCpu386 = 7,
+	MachoCpuMips = 8,
+	MachoCpu98000 = 10,
+	MachoCpuHppa = 11,
+	MachoCpuArm = 12,
+	MachoCpu88000 = 13,
+	MachoCpuSparc = 14,
+	MachoCpu860 = 15,
+	MachoCpuAlpha = 16,
+	MachoCpuPower = 18,
+
+	MachoCmdSegment = 1,
+	MachoCmdSymtab = 2,
+	MachoCmdSymseg = 3,
+	MachoCmdThread = 4,
+
+	MachoFileObject = 1,
+	MachoFileExecutable = 2,
+	MachoFileFvmlib = 3,
+	MachoFileCore = 4,
+	MachoFilePreload = 5,
+};
+
+struct MachoCmd
+{
+	int type;
+	ulong off;
+	ulong size;
+	struct {
+		char name[16+1];
+		ulong vmaddr;
+		ulong vmsize;
+		ulong fileoff;
+		ulong filesz;
+		ulong maxprot;
+		ulong initprot;
+		ulong nsect;
+		ulong flags;
+	} seg;
+	struct {
+		ulong symoff;
+		ulong nsyms;
+		ulong stroff;
+		ulong strsize;
+	} sym;
+};
+
+struct Macho
+{
+	int fd;
+	uint cputype;
+	uint subcputype;
+	ulong filetype;
+	ulong flags;
+	MachoCmd *cmd;
+	uint ncmd;
+	u32int (*e4)(uchar*);
+	int (*coreregs)(Macho*, uchar**);
+};
+
+Macho *machoopen(char*);
+Macho *machoinit(int);
+void machoclose(Macho*);
+int coreregsmachopower(Macho*, uchar**);