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Asked: 2026-05-19T10:36:16+00:00

My C++ project builds and runs fine on Linux. Now I am trying to

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My C++ project builds and runs fine on Linux. Now I am trying to compile it in VS2010. I get many errors seemingly from cmath library like the following one.

Error   1   error C2061: syntax error : identifier 'acosf'  c:\program files\microsoft visual studio 10.0\vc\include\cmath  19  1   MyPROJ

Also I get many file operations related compilation errors like:

Error   1   error C3861: 'lseek': identifier not found  g:\project\file.cc  274 1   MyPROJ

Error   2   error C3861: 'write': identifier not found  g:\project\file.cc  275 1   MyPROJ

How to eliminate these errors.

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1 Answer

  1. Editorial Team

    lseek and write are unix (posix?) calls that are not part of the C standard.
    They are available on windows but using the names _lseek and _write

    not sure about acosf though

    EDIT: acosf should be available, are you include math.h

    Edit more: Looking more closely at the original post the error is in cmath which is fine although then you probably have to write std::acosf – but the error is in the include file. It works fine when I try it so something before the include is likely conflicting. What is before the include of cmath in your source?

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