diff --git a/src/if_ruby.c b/src/if_ruby.c
index a67906a..417c44b 100644
--- a/src/if_ruby.c
+++ b/src/if_ruby.c
@@ -54,7 +54,7 @@
 #undef _
 
 /* T_DATA defined both by Ruby and Mac header files, hack around it... */
-#ifdef FEAT_GUI_MAC
+#ifdef MACOS
 # define __OPENTRANSPORT__
 # define __OPENTRANSPORTPROTOCOL__
 # define __OPENTRANSPORTPROVIDERS__
diff --git a/src/normal.c b/src/normal.c
index bd4b177..51cbd32 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -3567,9 +3567,9 @@
 }
 
 /*
- * check for operator or Visual active and clear it
+ * Check for operator or Visual active.  Clear active operator.
  *
- * return TRUE if operator was active
+ * Return TRUE if operator or Visual was active.
  */
     static int
 checkclearopq(oap)
diff --git a/src/proto/buffer.pro b/src/proto/buffer.pro
index d0556b6..509f390 100644
--- a/src/proto/buffer.pro
+++ b/src/proto/buffer.pro
@@ -1,70 +1,70 @@
 /* buffer.c */
-extern int open_buffer __ARGS((int read_stdin, exarg_T *eap));
-extern int buf_valid __ARGS((buf_T *buf));
-extern void close_buffer __ARGS((win_T *win, buf_T *buf, int action));
-extern void buf_clear_file __ARGS((buf_T *buf));
-extern void buf_freeall __ARGS((buf_T *buf, int del_buf, int wipe_buf));
-extern void goto_buffer __ARGS((exarg_T *eap, int start, int dir, int count));
-extern void handle_swap_exists __ARGS((buf_T *old_curbuf));
-extern char_u *do_bufdel __ARGS((int command, char_u *arg, int addr_count, int start_bnr, int end_bnr, int forceit));
-extern int do_buffer __ARGS((int action, int start, int dir, int count, int forceit));
-extern void set_curbuf __ARGS((buf_T *buf, int action));
-extern void enter_buffer __ARGS((buf_T *buf));
-extern void do_autochdir __ARGS((void));
-extern buf_T *buflist_new __ARGS((char_u *ffname, char_u *sfname, linenr_T lnum, int flags));
-extern void free_buf_options __ARGS((buf_T *buf, int free_p_ff));
-extern int buflist_getfile __ARGS((int n, linenr_T lnum, int options, int forceit));
-extern void buflist_getfpos __ARGS((void));
-extern buf_T *buflist_findname_exp __ARGS((char_u *fname));
-extern buf_T *buflist_findname __ARGS((char_u *ffname));
-extern int buflist_findpat __ARGS((char_u *pattern, char_u *pattern_end, int unlisted, int diffmode));
-extern int ExpandBufnames __ARGS((char_u *pat, int *num_file, char_u ***file, int options));
-extern buf_T *buflist_findnr __ARGS((int nr));
-extern char_u *buflist_nr2name __ARGS((int n, int fullname, int helptail));
-extern void get_winopts __ARGS((buf_T *buf));
-extern pos_T *buflist_findfpos __ARGS((buf_T *buf));
-extern linenr_T buflist_findlnum __ARGS((buf_T *buf));
-extern void buflist_list __ARGS((exarg_T *eap));
-extern int buflist_name_nr __ARGS((int fnum, char_u **fname, linenr_T *lnum));
-extern int setfname __ARGS((buf_T *buf, char_u *ffname, char_u *sfname, int message));
-extern void buf_set_name __ARGS((int fnum, char_u *name));
-extern void buf_name_changed __ARGS((buf_T *buf));
-extern buf_T *setaltfname __ARGS((char_u *ffname, char_u *sfname, linenr_T lnum));
-extern char_u *getaltfname __ARGS((int errmsg));
-extern int buflist_add __ARGS((char_u *fname, int flags));
-extern void buflist_slash_adjust __ARGS((void));
-extern void buflist_altfpos __ARGS((void));
-extern int otherfile __ARGS((char_u *ffname));
-extern void buf_setino __ARGS((buf_T *buf));
-extern void fileinfo __ARGS((int fullname, int shorthelp, int dont_truncate));
-extern void col_print __ARGS((char_u *buf, int col, int vcol));
-extern void maketitle __ARGS((void));
-extern void resettitle __ARGS((void));
-extern void free_titles __ARGS((void));
-extern int build_stl_str_hl __ARGS((win_T *wp, char_u *out, size_t outlen, char_u *fmt, int use_sandbox, int fillchar, int maxwidth, struct stl_hlrec *hltab, struct stl_hlrec *tabtab));
-extern void get_rel_pos __ARGS((win_T *wp, char_u *str));
-extern int append_arg_number __ARGS((win_T *wp, char_u *buf, int add_file, int maxlen));
-extern char_u *fix_fname __ARGS((char_u *fname));
-extern void fname_expand __ARGS((buf_T *buf, char_u **ffname, char_u **sfname));
-extern char_u *alist_name __ARGS((aentry_T *aep));
-extern void do_arg_all __ARGS((int count, int forceit, int keep_tabs));
-extern void ex_buffer_all __ARGS((exarg_T *eap));
-extern void do_modelines __ARGS((int flags));
-extern int read_viminfo_bufferlist __ARGS((vir_T *virp, int writing));
-extern void write_viminfo_bufferlist __ARGS((FILE *fp));
-extern char *buf_spname __ARGS((buf_T *buf));
-extern void buf_addsign __ARGS((buf_T *buf, int id, linenr_T lnum, int typenr));
-extern int buf_change_sign_type __ARGS((buf_T *buf, int markId, int typenr));
-extern int_u buf_getsigntype __ARGS((buf_T *buf, linenr_T lnum, int type));
-extern linenr_T buf_delsign __ARGS((buf_T *buf, int id));
-extern int buf_findsign __ARGS((buf_T *buf, int id));
-extern int buf_findsign_id __ARGS((buf_T *buf, linenr_T lnum));
-extern int buf_findsigntype_id __ARGS((buf_T *buf, linenr_T lnum, int typenr));
-extern int buf_signcount __ARGS((buf_T *buf, linenr_T lnum));
-extern void buf_delete_all_signs __ARGS((void));
-extern void sign_list_placed __ARGS((buf_T *rbuf));
-extern void sign_mark_adjust __ARGS((linenr_T line1, linenr_T line2, long amount, long amount_after));
-extern void set_buflisted __ARGS((int on));
-extern int buf_contents_changed __ARGS((buf_T *buf));
-extern void wipe_buffer __ARGS((buf_T *buf, int aucmd));
+int open_buffer __ARGS((int read_stdin, exarg_T *eap));
+int buf_valid __ARGS((buf_T *buf));
+void close_buffer __ARGS((win_T *win, buf_T *buf, int action));
+void buf_clear_file __ARGS((buf_T *buf));
+void buf_freeall __ARGS((buf_T *buf, int del_buf, int wipe_buf));
+void goto_buffer __ARGS((exarg_T *eap, int start, int dir, int count));
+void handle_swap_exists __ARGS((buf_T *old_curbuf));
+char_u *do_bufdel __ARGS((int command, char_u *arg, int addr_count, int start_bnr, int end_bnr, int forceit));
+int do_buffer __ARGS((int action, int start, int dir, int count, int forceit));
+void set_curbuf __ARGS((buf_T *buf, int action));
+void enter_buffer __ARGS((buf_T *buf));
+void do_autochdir __ARGS((void));
+buf_T *buflist_new __ARGS((char_u *ffname, char_u *sfname, linenr_T lnum, int flags));
+void free_buf_options __ARGS((buf_T *buf, int free_p_ff));
+int buflist_getfile __ARGS((int n, linenr_T lnum, int options, int forceit));
+void buflist_getfpos __ARGS((void));
+buf_T *buflist_findname_exp __ARGS((char_u *fname));
+buf_T *buflist_findname __ARGS((char_u *ffname));
+int buflist_findpat __ARGS((char_u *pattern, char_u *pattern_end, int unlisted, int diffmode));
+int ExpandBufnames __ARGS((char_u *pat, int *num_file, char_u ***file, int options));
+buf_T *buflist_findnr __ARGS((int nr));
+char_u *buflist_nr2name __ARGS((int n, int fullname, int helptail));
+void get_winopts __ARGS((buf_T *buf));
+pos_T *buflist_findfpos __ARGS((buf_T *buf));
+linenr_T buflist_findlnum __ARGS((buf_T *buf));
+void buflist_list __ARGS((exarg_T *eap));
+int buflist_name_nr __ARGS((int fnum, char_u **fname, linenr_T *lnum));
+int setfname __ARGS((buf_T *buf, char_u *ffname, char_u *sfname, int message));
+void buf_set_name __ARGS((int fnum, char_u *name));
+void buf_name_changed __ARGS((buf_T *buf));
+buf_T *setaltfname __ARGS((char_u *ffname, char_u *sfname, linenr_T lnum));
+char_u *getaltfname __ARGS((int errmsg));
+int buflist_add __ARGS((char_u *fname, int flags));
+void buflist_slash_adjust __ARGS((void));
+void buflist_altfpos __ARGS((void));
+int otherfile __ARGS((char_u *ffname));
+void buf_setino __ARGS((buf_T *buf));
+void fileinfo __ARGS((int fullname, int shorthelp, int dont_truncate));
+void col_print __ARGS((char_u *buf, int col, int vcol));
+void maketitle __ARGS((void));
+void resettitle __ARGS((void));
+void free_titles __ARGS((void));
+int build_stl_str_hl __ARGS((win_T *wp, char_u *out, size_t outlen, char_u *fmt, int use_sandbox, int fillchar, int maxwidth, struct stl_hlrec *hltab, struct stl_hlrec *tabtab));
+void get_rel_pos __ARGS((win_T *wp, char_u *str));
+int append_arg_number __ARGS((win_T *wp, char_u *buf, int add_file, int maxlen));
+char_u *fix_fname __ARGS((char_u *fname));
+void fname_expand __ARGS((buf_T *buf, char_u **ffname, char_u **sfname));
+char_u *alist_name __ARGS((aentry_T *aep));
+void do_arg_all __ARGS((int count, int forceit, int keep_tabs));
+void ex_buffer_all __ARGS((exarg_T *eap));
+void do_modelines __ARGS((int flags));
+int read_viminfo_bufferlist __ARGS((vir_T *virp, int writing));
+void write_viminfo_bufferlist __ARGS((FILE *fp));
+char *buf_spname __ARGS((buf_T *buf));
+void buf_addsign __ARGS((buf_T *buf, int id, linenr_T lnum, int typenr));
+int buf_change_sign_type __ARGS((buf_T *buf, int markId, int typenr));
+int_u buf_getsigntype __ARGS((buf_T *buf, linenr_T lnum, int type));
+linenr_T buf_delsign __ARGS((buf_T *buf, int id));
+int buf_findsign __ARGS((buf_T *buf, int id));
+int buf_findsign_id __ARGS((buf_T *buf, linenr_T lnum));
+int buf_findsigntype_id __ARGS((buf_T *buf, linenr_T lnum, int typenr));
+int buf_signcount __ARGS((buf_T *buf, linenr_T lnum));
+void buf_delete_all_signs __ARGS((void));
+void sign_list_placed __ARGS((buf_T *rbuf));
+void sign_mark_adjust __ARGS((linenr_T line1, linenr_T line2, long amount, long amount_after));
+void set_buflisted __ARGS((int on));
+int buf_contents_changed __ARGS((buf_T *buf));
+void wipe_buffer __ARGS((buf_T *buf, int aucmd));
 /* vim: set ft=c : */
diff --git a/src/proto/os_amiga.pro b/src/proto/os_amiga.pro
index 4ac96aa..3cbec6d 100644
--- a/src/proto/os_amiga.pro
+++ b/src/proto/os_amiga.pro
@@ -1,46 +1,46 @@
 /* os_amiga.c */
-extern void win_resize_on __ARGS((void));
-extern void win_resize_off __ARGS((void));
-extern void mch_write __ARGS((char_u *p, int len));
-extern int mch_inchar __ARGS((char_u *buf, int maxlen, long time, int tb_change_cnt));
-extern int mch_char_avail __ARGS((void));
-extern long_u mch_avail_mem __ARGS((int special));
-extern void mch_delay __ARGS((long msec, int ignoreinput));
-extern void mch_suspend __ARGS((void));
-extern void mch_init __ARGS((void));
-extern int mch_check_win __ARGS((int argc, char **argv));
-extern int mch_input_isatty __ARGS((void));
-extern void fname_case __ARGS((char_u *name, int len));
-extern void mch_settitle __ARGS((char_u *title, char_u *icon));
-extern void mch_restore_title __ARGS((int which));
-extern int mch_can_restore_title __ARGS((void));
-extern int mch_can_restore_icon __ARGS((void));
-extern int mch_get_user_name __ARGS((char_u *s, int len));
-extern void mch_get_host_name __ARGS((char_u *s, int len));
-extern long mch_get_pid __ARGS((void));
-extern int mch_dirname __ARGS((char_u *buf, int len));
-extern int mch_FullName __ARGS((char_u *fname, char_u *buf, int len, int force));
-extern int mch_isFullName __ARGS((char_u *fname));
-extern long mch_getperm __ARGS((char_u *name));
-extern int mch_setperm __ARGS((char_u *name, long perm));
-extern void mch_hide __ARGS((char_u *name));
-extern int mch_isdir __ARGS((char_u *name));
-extern int mch_mkdir __ARGS((char_u *name));
-extern int mch_can_exe __ARGS((char_u *name));
-extern int mch_nodetype __ARGS((char_u *name));
-extern void mch_early_init __ARGS((void));
-extern void mch_exit __ARGS((int r));
-extern void mch_settmode __ARGS((int tmode));
-extern int mch_screenmode __ARGS((char_u *arg));
-extern int mch_get_shellsize __ARGS((void));
-extern void mch_set_shellsize __ARGS((void));
-extern void mch_new_shellsize __ARGS((void));
-extern int mch_call_shell __ARGS((char_u *cmd, int options));
-extern void mch_breakcheck __ARGS((void));
-extern long Chk_Abort __ARGS((void));
-extern int mch_expandpath __ARGS((garray_T *gap, char_u *pat, int flags));
-extern int mch_has_exp_wildcard __ARGS((char_u *p));
-extern int mch_has_wildcard __ARGS((char_u *p));
-extern char_u *mch_getenv __ARGS((char_u *var));
-extern int mch_setenv __ARGS((char *var, char *value, int x));
+void win_resize_on __ARGS((void));
+void win_resize_off __ARGS((void));
+void mch_write __ARGS((char_u *p, int len));
+int mch_inchar __ARGS((char_u *buf, int maxlen, long time, int tb_change_cnt));
+int mch_char_avail __ARGS((void));
+long_u mch_avail_mem __ARGS((int special));
+void mch_delay __ARGS((long msec, int ignoreinput));
+void mch_suspend __ARGS((void));
+void mch_init __ARGS((void));
+int mch_check_win __ARGS((int argc, char **argv));
+int mch_input_isatty __ARGS((void));
+void fname_case __ARGS((char_u *name, int len));
+void mch_settitle __ARGS((char_u *title, char_u *icon));
+void mch_restore_title __ARGS((int which));
+int mch_can_restore_title __ARGS((void));
+int mch_can_restore_icon __ARGS((void));
+int mch_get_user_name __ARGS((char_u *s, int len));
+void mch_get_host_name __ARGS((char_u *s, int len));
+long mch_get_pid __ARGS((void));
+int mch_dirname __ARGS((char_u *buf, int len));
+int mch_FullName __ARGS((char_u *fname, char_u *buf, int len, int force));
+int mch_isFullName __ARGS((char_u *fname));
+long mch_getperm __ARGS((char_u *name));
+int mch_setperm __ARGS((char_u *name, long perm));
+void mch_hide __ARGS((char_u *name));
+int mch_isdir __ARGS((char_u *name));
+int mch_mkdir __ARGS((char_u *name));
+int mch_can_exe __ARGS((char_u *name));
+int mch_nodetype __ARGS((char_u *name));
+void mch_early_init __ARGS((void));
+void mch_exit __ARGS((int r));
+void mch_settmode __ARGS((int tmode));
+int mch_screenmode __ARGS((char_u *arg));
+int mch_get_shellsize __ARGS((void));
+void mch_set_shellsize __ARGS((void));
+void mch_new_shellsize __ARGS((void));
+int mch_call_shell __ARGS((char_u *cmd, int options));
+void mch_breakcheck __ARGS((void));
+long Chk_Abort __ARGS((void));
+int mch_expandpath __ARGS((garray_T *gap, char_u *pat, int flags));
+int mch_has_exp_wildcard __ARGS((char_u *p));
+int mch_has_wildcard __ARGS((char_u *p));
+char_u *mch_getenv __ARGS((char_u *var));
+int mch_setenv __ARGS((char *var, char *value, int x));
 /* vim: set ft=c : */