make -j`nproc` error

[BigGitWorld]

make -j`nproc` results in the below error:

Scanning dependencies of target flutter-pi
[ 25%] Building C object CMakeFiles/flutter-pi.dir/src/platformchannel.c.o
[ 25%] Building C object CMakeFiles/flutter-pi.dir/src/flutter-pi.c.o
[ 25%] Building C object CMakeFiles/flutter-pi.dir/src/pluginregistry.c.o
[ 25%] Building C object CMakeFiles/flutter-pi.dir/src/texture_registry.c.o
In file included from /home/pi/flutter_all/flutter-pi/include/platformchannel.h:6,
                 from /home/pi/flutter_all/flutter-pi/src/pluginregistry.c:11:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
In file included from /home/pi/flutter_all/flutter-pi/include/platformchannel.h:6,
                 from /home/pi/flutter_all/flutter-pi/src/pluginregistry.c:11:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/src/texture_registry.c:8:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
In file included from /home/pi/flutter_all/flutter-pi/src/texture_registry.c:8:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/src/platformchannel.c:9:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
In file included from /home/pi/flutter_all/flutter-pi/src/platformchannel.c:9:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/include/platformchannel.h:6,
                 from /home/pi/flutter_all/flutter-pi/src/platformchannel.c:11:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/include/texture_registry.h:5,
                 from /home/pi/flutter_all/flutter-pi/src/texture_registry.c:10:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/include/plugins/omxplayer_video_player.h:11,
                 from /home/pi/flutter_all/flutter-pi/src/pluginregistry.c:28:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
make[2]: *** [CMakeFiles/flutter-pi.dir/build.make:89: CMakeFiles/flutter-pi.dir/src/pluginregistry.c.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from /home/pi/flutter_all/flutter-pi/include/flutter-pi.h:27,
                 from /home/pi/flutter_all/flutter-pi/src/texture_registry.c:11:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/include/flutter-pi.h:27,
                 from /home/pi/flutter_all/flutter-pi/src/platformchannel.c:12:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
make[2]: *** [CMakeFiles/flutter-pi.dir/build.make:102: CMakeFiles/flutter-pi.dir/src/texture_registry.c.o] Error 1
In file included from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:45:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
In file included from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:45:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/include/flutter-pi.h:27,
                 from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:47:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
make[2]: *** [CMakeFiles/flutter-pi.dir/build.make:76: CMakeFiles/flutter-pi.dir/src/platformchannel.c.o] Error 1
In file included from /home/pi/flutter_all/flutter-pi/include/compositor.h:7,
                 from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:48:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/include/user_input.h:5,
                 from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:50:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/include/locales.h:4,
                 from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:51:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:51:
/home/pi/flutter_all/flutter-pi/include/locales.h:33:77: error: unknown type name ‘FlutterEngineUpdateLocalesFnPtr’; did you mean ‘FlutterEngineAOTDataSource’?
 int locales_add_to_fl_engine(struct locales *locales, FlutterEngine engine, FlutterEngineUpdateLocalesFnPtr update_locales);
                                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                                             FlutterEngineAOTDataSource
In file included from /home/pi/flutter_all/flutter-pi/include/platformchannel.h:6,
                 from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:52:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
In file included from /home/pi/flutter_all/flutter-pi/include/texture_registry.h:5,
                 from /home/pi/flutter_all/flutter-pi/src/flutter-pi.c:54:
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:1594: error: unterminated #ifndef
 #ifndef FLUTTER_ENGINE_NO_PROTOTYPES
 
/home/pi/flutter_all/flutter-pi/build/flutter_embedder.h:5: error: unterminated #ifndef
 #ifndef FLUTTER_EMBEDDER_H_
 
/home/pi/flutter_all/flutter-pi/src/flutter-pi.c: In function ‘init_application’:
/home/pi/flutter_all/flutter-pi/src/flutter-pi.c:1868:7: warning: implicit declaration of function ‘locales_add_to_fl_engine’; did you mean ‘locale_get_fl_locale’? [-Wimplicit-function-declaration]
  ok = locales_add_to_fl_engine(flutterpi.locales, flutterpi.flutter.engine, libflutter_engine->FlutterEngineUpdateLocales);
       ^~~~~~~~~~~~~~~~~~~~~~~~
       locale_get_fl_locale
make[2]: *** [CMakeFiles/flutter-pi.dir/build.make:63: CMakeFiles/flutter-pi.dir/src/flutter-pi.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/flutter-pi.dir/all] Error 2
make: *** [Makefile:130: all] Error 2

also :
flutter-pi/build -> cmake .. results in:

cmake ..
-- CMAKE_BUILD_TYPE not set, defaulting to Release.
-- The C compiler identification is GNU 8.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Generator .............. Unix Makefiles
-- Build Type ............. Release
-- Flutter Channel not set, defaulting to stable
-- Flutter Channel ........ stable
-- Engine SHA1 ............ ab46186b246f5a36bd1f3f295d14a43abb1e2f38
-- PKG_CONFIG_PATH ........ 
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29") 
-- Checking for module 'libdrm'
--   Found libdrm, version 2.4.100
-- Checking for module 'gbm'
--   Found gbm, version 19.3.2
-- Checking for module 'egl'
--   Found egl, version 1.5
-- Checking for module 'glesv2'
--   Found glesv2, version 3.2
-- Checking for module 'libsystemd'
--   Found libsystemd, version 241
-- Checking for module 'libinput'
--   Found libinput, version 1.12.6
-- Checking for module 'xkbcommon'
--   Found xkbcommon, version 0.8.2
-- Checking for module 'libudev'
--   Found libudev, version 241
-- Configuring done
-- Generating done
-- Build files have been written to: /home/pi/flutter_all/flutter-pi/build

what is the problem?

[ardera]

It looks like something went wrong while fetching the flutter_embedder.h. Did you try deleting the build folder and reconfiguring?