problem in gcc & gdb installation

[MANIGANDAN V]

** Proprietary **

              I am a new cygwin user i have downloaded almost all necessary packages.I have got 2 problems now
                1.After installing gcc i could not find gcc.exe on /usr/bin rather it is found in a separate directory on root.(Same case for gdb/dejagnu/ddd) & now how should compile my c prog's.(I cant use ./configure.in inside my gcc directory or make without even installing compiler isn't).And also when next time when i run setup.exe program for cygwin installation it is saying that gc/gdb/binutils/ddd are not installed but not other packages..
                2.When i run vi or vim  it gives error unable to find 
cygncurses5.dll.Where to get this dll file?? & where to put in cygwin..
Is there any good document for knowing the basic mechanism of cygwin & how it works(I feel getting started guide & FAQ is not sufficient for me)
Thank u
Manigandan Varadharajan






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