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Hi
Thanks for the help. This is the Eclipse build log:
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**** Build of configuration Debug for project Cit_X_Neu ****

make all
Building file: ../Scene.c
Invoking: GCC C Compiler
gcc -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"Scene.d" -
MT"Scene.d" -o"Scene.o" "../Scene.c"
Finished building: ../Scene.c

Building file: ../carmine_addons.c
Invoking: GCC C Compiler
gcc -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"carmine_addons.d"
-MT"carmine_addons.d" -o"carmine_addons.o" "../carmine_addons.c"
.../carmine_addons.c: In function ‘loadTexture’:
.../carmine_addons.c:55: warning: unused variable ‘h’
.../carmine_addons.c:54: warning: unused variable ‘w’
Finished building: ../carmine_addons.c

Building file: ../carmine_defs.c
Invoking: GCC C Compiler
gcc -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"carmine_defs.d" -
MT"carmine_defs.d" -o"carmine_defs.o" "../carmine_defs.c"
.../carmine_defs.c: In function ‘positionCamera’:
.../carmine_defs.c:23: warning: unused variable ‘arrfMat’
.../carmine_defs.c:22: warning: unused variable ‘k’
.../carmine_defs.c:22: warning: unused variable ‘j’
.../carmine_defs.c:22: warning: unused variable ‘i’
Finished building: ../carmine_defs.c

Building file: ../main.cpp
Invoking: GCC C++ Compiler
g++ -DLIN=1 -DIBM=0 -DAPL=0 -DXPLM200 -I/usr/include/freetype2 -I/usr/
local/include/FTGL -I/usr/local/include/freetype2 -I/usr/local/include
-I/usr/include/GL -I/usr/include/freetype -I/usr/include/SDL -I/home/
michael/CPP/Cit_X_Neu/includes -I/home/michael/CPP/SDK/CHeaders/XPLM -
O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"main.d" -MT"main.d" -
o"main.o" "../main.cpp"
Finished building: ../main.cpp

Building target: Cit_X.xpl
Invoking: GCC C++ Linker
g++ -shared -o"Cit_X.xpl" ./Scene.o ./carmine_addons.o ./
carmine_defs.o ./main.o -lGLee -lSDL -lGL -lGLU -lstdc++ -lfreetype -
lfreeimage -lftgl -lSDL_image
Finished building target: Cit_X.xpl

Just found out that the defnition of createParent has to be in main.cpp.
( I did only some VB.NET so far )
Anyway could I leave them somehow in carmine_defs.c?
Thanks and regards
Michael