diff --git a/src/os_amiga.h b/src/os_amiga.h
new file mode 100644
index 0000000..06e4d1c
--- /dev/null
+++ b/src/os_amiga.h
@@ -0,0 +1,201 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ */
+
+/*
+ * Amiga Machine-dependent things
+ */
+
+#define CASE_INSENSITIVE_FILENAME   /* ignore case when comparing file names */
+#define SPACE_IN_FILENAME
+#define USE_FNAME_CASE		    /* adjust case of file names */
+#define USE_TERM_CONSOLE
+#define HAVE_AVAIL_MEM
+
+#ifndef HAVE_CONFIG_H
+# ifdef AZTEC_C
+#  define HAVE_STAT_H
+# endif
+# define HAVE_STDLIB_H
+# define HAVE_STRING_H
+# define HAVE_FCNTL_H
+# define HAVE_STRCSPN
+# define HAVE_STRICMP
+# define HAVE_STRNICMP
+# define HAVE_STRFTIME	    /* guessed */
+# define HAVE_SETENV
+# define HAVE_MEMSET
+# define HAVE_QSORT
+# if defined(__DATE__) && defined(__TIME__)
+#  define HAVE_DATE_TIME
+# endif
+
+#define DFLT_ERRORFILE		"AztecC.Err"
+#define DFLT_RUNTIMEPATH "home:vimfiles,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,home:vimfiles/after"
+
+#define BASENAMELEN	26	/* Amiga */
+
+#define TEMPNAME	"t:v?XXXXXX"
+#define TEMPNAMELEN	12
+
+#endif /* HAVE_CONFIG_H */
+
+#include <exec/types.h>
+#include <libraries/dos.h>
+#include <libraries/dosextens.h>
+
+/* Currently, all Amiga compilers except AZTEC C have these... */
+#ifndef AZTEC_C
+# include <proto/exec.h>
+# include <proto/dos.h>
+# include <proto/intuition.h>
+#endif
+
+#define FNAME_ILLEGAL ";*?`#%" /* illegal characters in a file name */
+
+/*
+ * Manx doesn't have off_t, define it here.
+ */
+#ifdef AZTEC_C
+typedef long off_t;
+#endif
+
+#ifdef LATTICE
+# define USE_TMPNAM	/* use tmpnam() instead of mktemp() */
+#endif
+
+#ifdef __GNUC__
+# include <sys/stat.h>
+# include <unistd.h>
+#endif
+
+/*
+ * arpbase.h must be included before functions.h
+ */
+#ifdef FEAT_ARP
+# include <libraries/arpbase.h>
+#endif
+
+/*
+ * This won't be needed if you have a version of Lattice 4.01 without broken
+ * break signal handling.
+ */
+#include <signal.h>
+
+/*
+ * Names for the EXRC, HELP and temporary files.
+ * Some of these may have been defined in the makefile.
+ */
+#ifndef SYS_VIMRC_FILE
+# define SYS_VIMRC_FILE "$VIM/vimrc"
+#endif
+#ifndef SYS_GVIMRC_FILE
+# define SYS_GVIMRC_FILE "$VIM/gvimrc"
+#endif
+#ifndef SYS_MENU_FILE
+# define SYS_MENU_FILE	"$VIMRUNTIME/menu.vim"
+#endif
+#ifndef DFLT_HELPFILE
+# define DFLT_HELPFILE	"$VIMRUNTIME/doc/help.txt"
+#endif
+#ifndef FILETYPE_FILE
+# define FILETYPE_FILE	"filetype.vim"
+#endif
+#ifndef FTPLUGIN_FILE
+# define FTPLUGIN_FILE	"ftplugin.vim"
+#endif
+#ifndef INDENT_FILE
+# define INDENT_FILE	"indent.vim"
+#endif
+#ifndef FTOFF_FILE
+# define FTOFF_FILE	"ftoff.vim"
+#endif
+#ifndef FTPLUGOF_FILE
+# define FTPLUGOF_FILE	"ftplugof.vim"
+#endif
+#ifndef INDOFF_FILE
+# define INDOFF_FILE	"indoff.vim"
+#endif
+#ifndef SYNTAX_FNAME
+# define SYNTAX_FNAME	"$VIMRUNTIME/syntax/%s.vim"
+#endif
+
+#ifndef USR_EXRC_FILE
+# define USR_EXRC_FILE	"s:.exrc"
+#endif
+#ifndef USR_EXRC_FILE2
+# define USR_EXRC_FILE2	"home:.exrc"
+#endif
+
+#ifndef USR_VIMRC_FILE
+# define USR_VIMRC_FILE	"s:.vimrc"
+#endif
+#ifndef USR_VIMRC_FILE2
+# define USR_VIMRC_FILE2 "home:.vimrc"
+#endif
+#ifndef USR_VIMRC_FILE3
+# define USR_VIMRC_FILE3 "$VIM/.vimrc"
+#endif
+#ifndef EVIM_FILE
+# define EVIM_FILE	"$VIMRUNTIME/evim.vim"
+#endif
+
+#ifndef USR_GVIMRC_FILE
+# define USR_GVIMRC_FILE "s:.gvimrc"
+#endif
+#ifndef USR_GVIMRC_FILE2
+# define USR_GVIMRC_FILE2 "home:.gvimrc"
+#endif
+#ifndef USR_GVIMRC_FILE3
+# define USR_GVIMRC_FILE3 "$VIM/.gvimrc"
+#endif
+
+#ifdef FEAT_VIMINFO
+#ifndef VIMINFO_FILE
+# define VIMINFO_FILE	"s:.viminfo"
+#endif
+#endif /* FEAT_VIMINFO */
+
+#ifndef EXRC_FILE
+# define EXRC_FILE	".exrc"
+#endif
+
+#ifndef VIMRC_FILE
+# define VIMRC_FILE	".vimrc"
+#endif
+
+#ifndef GVIMRC_FILE
+# define GVIMRC_FILE	".gvimrc"
+#endif
+
+#ifndef DFLT_BDIR
+# define DFLT_BDIR	".,t:"		/* default for 'backupdir' */
+#endif
+
+#ifndef DFLT_DIR
+# define DFLT_DIR	".,t:"		/* default for 'directory' */
+#endif
+
+#ifndef DFLT_VDIR
+# define DFLT_VDIR	"$VIM/vimfiles/view"	/* default for 'viewdir' */
+#endif
+
+#ifndef DFLT_MAXMEM
+# define DFLT_MAXMEM	256		/* use up to 256Kbyte for buffer */
+#endif
+#ifndef DFLT_MAXMEMTOT
+# define DFLT_MAXMEMTOT	0		/* decide in set_init */
+#endif
+
+#if defined(SASC)
+int setenv(const char *, const char *);
+#endif
+
+#define mch_remove(x) remove((char *)(x))
+#define mch_rename(src, dst) rename(src, dst)
+#define mch_chdir(s) chdir(s)
+#define vim_mkdir(x, y) mch_mkdir(x)