Hi there! Not sure if It"s the right thing to do, but I adjusted tutorial 1 code (hello world) like this: ------------------------------------------------------------- #include <tqapplication.h> #include <tqpushbutton.h> int main( int argc, char **argv ) { TQApplication a( argc, argv ); TQPushButton hello( "Hello world!", 0 ); hello.resize( 100, 30 ); a.setMainWidget( &hello ); hello.show(); return a.exec(); } ------------------------------------------------------------ Since I've compiled Trinity by myself the headers are located in /usr/include/tqt and /usr/include/tqt3, the libraries (all of them) in /usr/lib64. I had to adjust the Makefile file accordingly, like this: --------------------------------------------------------------------------------------------------------------------- INCPATH = -I/usr/share/tqt3/mkspecs/default -I. -I/usr/include/tqt -I/usr/include/tqt3 LINK = g++ LFLAGS = -luuid -Wl,-rpath,/usr/lib64 LIBS = $(SUBLIBS) -L/usr/lib64 -L/usr/X11R6/lib -luuid -ltqt-mt -lXext -lX11 -lm -lpthread --------------------------------------------------------------------------------------------------------------------- Hope that help!