@jakobschauer Maybe you should PDINCLUDEDIR=../pure-data/src ..... without the forward slash at the end, as it is looking for ../pure-data/src//m_pd.h ..... which presumably doesn't work with the double slash.

I am pretty certain that m_pd.h is in that directory.
David.

Hey @whale-av,
thanks so much for the answer, sounds pretty legit. however I tried and i am still getting the same answer without the double slash:

pd_helios-master % make PDINCLUDEDIR=../pure-data/src
ls: ../pure-data/src/m_pd.h: No such file or directory
++++ info: using Makefile.pdlibbuilder version 0.5.1
src/pd-lib-builder/Makefile.pdlibbuilder:759: Where is Pd API m_pd.h? Do 'make help' for info.
++++ info: making target all in lib helios
++++ info: evaluating implicit prerequisites in lib helios.....
src/helios.cpp:12:10: fatal error: 'm_pd.h' file not found
#include "m_pd.h"
^~~~~~~~
1 error generated.
src/pd-lib-builder/Makefile.pdlibbuilder:974: *** missing separator. Stop.

i also do not find the m_pd.h file in my finder (if thats even poissible)

i first do:
cd /Users/jakobschauer/Documents/Pd/externals/pd_helios-master
then:
PDINCLUDEDIR=../pure-data/src
right? 🤔

i also tried on another machine IOS 12.0.1. same same

@jakobschauer Here is m-pd.h from pd 0.54.1 .... m_pd.h .... I haven't compared it to older versions so if you are trying to build for another version of Pd please ask.

Here are all the files from the source folder of that version...... Pd source 0.54.1.zip
I hope that helps but I have no idea how to compile correctly. They are from a windows version but I think .h files are the same.
If not then download Pd without installing it and go to the /src folder to find them.
David.

David, thanks so much!
I´ll try asap with those files!
☺️