Well, ok, I understand your previous post now

I made a make clean, and look to what I get :
[famille@localhost amsnplus]$ su
Password:
[root@localhost amsnplus]# make clean
rm snapshot
[root@localhost amsnplus]# make
gcc snapshot.c -o snapshot `imlib-config --cflags` `imlib-config --libs`
/bin/sh: imlib-config: command not found
/bin/sh: imlib-config: command not found
snapshot.c:2:19: error: Imlib.h: Aucun fichier ou répertoire de ce type
snapshot.c: In function 'main':
snapshot.c:12: error: 'ImlibData' undeclared (first use in this function)
snapshot.c:12: error: (Each undeclared identifier is reported only once
snapshot.c:12: error: for each function it appears in.)
snapshot.c:12: error: 'id' undeclared (first use in this function)
snapshot.c:13: error: 'ImlibImage' undeclared (first use in this function)
snapshot.c:13: error: 'im' undeclared (first use in this function)
snapshot.c:17: warning: incompatible implicit declaration of built-in function 'printf'
snapshot.c:24: warning: incompatible implicit declaration of built-in function 'printf'
make: *** [snapshot] Erreur 1
[root@localhost amsnplus]#
It seems to be the same error as you get

So I'll install "imlib11-dev" as you did, then "make" and I hope this will work. Thanks !