Sorry, if I'm being obvious: I found 'sys_getversion' at the end of m_glob.c 
which returns major and minor version number at runtime.

Gesendet: Donnerstag, 22. September 2016 um 17:56 Uhr
Von: "Antoine Rousseau" <>
An: Kein Empfänger
Cc: Pd-list <>
Betreff: Re: [PD] Tcl error for [knob] and [mknob]

Thanks a lot ! I think I get it. I'll do it asap.
2016-09-22 17:06 GMT+02:00 IOhannes m zmoelnig <>:On 2016-09-22 
12:21, Antoine Rousseau wrote:
> 2016-09-22 11:03 GMT+02:00 IOhannes m zmoelnig 
> <[]>:
>> On 2016-09-22 08:37, Antoine Rousseau wrote:
>>> you need
>>> to be aware of the version at compilation time, and have to use this
>>> version at runtime. So I don't think you can build an external that would
>>> be compatible for both versions.
>> why?
> Because interfaces changed :
> -void iemgui_save(t_iemgui *iemgui, t_symbol **srl, int *bflcol)
> +void iemgui_save(t_iemgui *iemgui, t_symbol **srl, t_symbol**bflcol)
> so how could I build a binary that would switch the interface of iemgui_save
> at runtime, following the version of the running Pd ?

in pseudo code:
  iemgui_save(x, srl, i_color);
  iemgui_save(x, srl, s_color);

this will give you some compiler warnings, but you can do:

typedef void(t_iemgui_save_old*)(t_iemgui *iemgui, t_symbol **srl, int
typedef void(t_iemgui_save_new*)(t_iemgui *iemgui, t_symbol **srl,
t_symbol **bflcol);

if(pd<0.47) {
    t_iemgui_save_old isave=(t_iemgui_save_old)iemgui_save;
    isave(x, srl, i_color);
} else {
    t_iemgui_save_old isave=(t_iemgui_save_new)iemgui_save;
    isave(x, srl, s_color);


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