Python.h not found

[Gerrer <gerrer@…>]

I try this example to include a Python function in OpenModelica:

​https://openmodelica.org/doc/OpenModelicaUsersGuide/latest/interop_c_python.html

However I get following error :

make -j2 -f CallExternalPython.makefile
clang -Os -fPIC -mfpmath=sse -fno-dollars-in-identifiers -I"/usr/bin/../include/omc/c" -I. -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME -DOMC_MODEL_PREFIX=CallExternalPython -DOMC_NUM_MIXED_SYSTEMS=0 -DOMC_NUM_LINEAR_SYSTEMS=0 -DOMC_NUM_NONLINEAR_SYSTEMS=0 -DOMC_NDELAY_EXPRESSIONS=0 -DOMC_NVAR_STRING=0 -c -o CallExternalPython.o CallExternalPython.c
clang -Os -fPIC -mfpmath=sse -fno-dollars-in-identifiers -I"/usr/bin/../include/omc/c" -I. -DOPENMODELICA_XML_FROM_FILE_AT_RUNTIME -DOMC_MODEL_PREFIX=CallExternalPython -DOMC_NUM_MIXED_SYSTEMS=0 -DOMC_NUM_LINEAR_SYSTEMS=0 -DOMC_NUM_NONLINEAR_SYSTEMS=0 -DOMC_NDELAY_EXPRESSIONS=0 -DOMC_NVAR_STRING=0 -c -o CallExternalPython_functions.o CallExternalPython_functions.c
In file included from CallExternalPython_functions.c:7:
./CallExternalPython_includes.h:5:10: fatal error: 'Python.h' file not found
#include <Python.h>

^~

1 error generated.
<builtin>: recipe for target 'CallExternalPython_functions.o' failed
make: * [CallExternalPython_functions.o] Error 1
make: * Waiting for unfinished jobs....
Compilation process failed. Exited with code 2.

I checked that gcc is installed. I have the package python3-dev, so that Python.h exists.
I copied a path to Python.h in the ModelicaPath to be sure it's not a path issue.

Any idea how I could solve this ?

[casella]

Retargeted to 1.18.0 because of 1.17.0 timed release.

[casella]

Ticket retargeted after milestone closed