Go undefined imported function

I have a problem using a function when there should not be any problem. In Go, a Function that starts with a capital letter has a visibility outside the package.

node.go

package grid type Node struct { id uint name string pos_i uint pos_j uint node_type string } 

grid.go

package grid /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ the Grid Structure ____________________________________________________________________________ */ type Grid struct { // The numbers of divisions in the Grid number_lines uint number_columns uint // The Sizes of the Grid width uint height uint // An Array of the Nodes nodes []Node } /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Initialize the Grid ____________________________________________________________________________ */ func InitGrid() *Grid { g := new(Grid) g.number_lines = 4 g.number_columns = 4 g.width = 400 g.height = 400 return g } 

main.go

package main import ( "fmt" "grid" ) /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Entry Point of the Application ____________________________________________________________________________ */ func main() { grid_ := grid.InitGrid() fmt.Println(grid_) } 

src/grid/Makefile

include $(GOROOT)/src/Make.inc TARG=grid GOFILES=\ node.go\ grid.go\ include $(GOROOT)/src/Make.pkg 

src/main/Makefile

include $(GOROOT)/src/Make.inc TARG=main GOFILES=\ main.go\ include $(GOROOT)/src/Make.cmd 

When I compile the grid package, everything goes well, but when I try to compile le main package, it gives me that error message:

manbear@manbearpig:~/Bureau/go_code/main$ gomake 6g -o _go_.6 main.go main.go:15: undefined: grid.InitGrid make: *** [_go_.6] Erreur 1 

I don't understand why it gives me that error, I've passed some time reading the Go documentation, but I don't find the reason why it doesn't work.

Thank you for your help.