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Ok thanks!

Hey!
I'm trying to install TGUI on ubuntu. cmake works just fine, but

sudo make install -j6

gives me the following output :

chrescht@ubuntu:~/Downloads/TGUI-0.6.7$ sudo make install -j6
[ 89%] Built target tgui
Linking CXX executable FormBuilder
../../../lib/libtgui.so.0.6.7: undefined reference to `sf::String::substring(unsigned long, unsigned long) const'
../../../lib/libtgui.so.0.6.7: undefined reference to `sf::Image::~Image()'
collect2: error: ld returned 1 exit status
make[2]: *** [src/TGUI/FormBuilder/FormBuilder] Error 1
make[1]: *** [src/TGUI/FormBuilder/CMakeFiles/FormBuilder.dir/all] Error 2
make: *** [all] Error 2
chrescht@ubuntu:~/Downloads/TGUI-0.6.7$ sudo make install -j6
[sudo] password for chrescht:
[ 89%] Built target tgui
Linking CXX executable FormBuilder
../../../lib/libtgui.so.0.6.7: undefined reference to `sf::String::substring(unsigned long, unsigned long) const'
../../../lib/libtgui.so.0.6.7: undefined reference to `sf::Image::~Image()'
collect2: error: ld returned 1 exit status
make[2]: *** [src/TGUI/FormBuilder/FormBuilder] Error 1
make[1]: *** [src/TGUI/FormBuilder/CMakeFiles/FormBuilder.dir/all] Error 2
make: *** [all] Error 2

does anyone know the source of this problem? I just installed sfml, very new to it.