Paulo Ricardo Batista Mesquita <pmesquita@atech.br> writes: > and I tried to compile this using > > gcc -g -s testeGTK.c -o testeGTK 'pkg-config --cflags --libs gtk+-2.0'. The quotes around the pkg-config bit are wrong. It has to be: `pkg-config --cflags --libs gtk+-2.0` not 'pkg-config --cflags --libs gtk+-2.0' On unix putting things into `-quotes (backpings) means "execute this command and put its output here".