cannot find interface declaration for ‘NXCo nstantString’

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I am working on Objective C, I am trying to run a simple program on termina=
l of ubuntu by giving the following command:
gcc source.m -o source
but compiler has given error like:
source.m:1:34: error: Foundation/Foundation.h: No such file or directory
source.m: In function =E2=80=98main=E2=80=99:
source.m:4: error: cannot find interface declaration for =E2=80=98NXConstan=
tString=E2=80=99
please help me to run my program.


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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">I am working on Objective C, I am trying to r=
un a simple program on terminal of ubuntu by giving the following command:<=
br><span style=3D"font-weight: bold;">gcc source.m -o source</span><br>but =
compiler has given error like:<br><span style=3D"font-weight: bold;">source=
.m:1:34: error: Foundation/Foundation.h: No such file or directory</span><b=
r style=3D"font-weight: bold;"><span style=3D"font-weight: bold;">source.m:=
 In function =E2=80=98main=E2=80=99:</span><br style=3D"font-weight: bold;"=
><span style=3D"font-weight: bold;">source.m:4: error: cannot find interfac=
e declaration for =E2=80=98NXConstantString=E2=80=99</span><br style=3D"fon=
t-weight: bold;">please help me to run my program.<br style=3D"font-weight:=
 bold;"><br></td></tr></table>
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