# \#make

**URL:** https://discourse.itk.org/tag/make/208.md

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## [Compile time is very long -- how to optimize?](https://discourse.itk.org/t/compile-time-is-very-long-how-to-optimize/5196)

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**Author:** [@gmm9uf](https://discourse.itk.org/u/gmm9uf)\
**Replies:** 8\
**Last updated:** [July 26, 2022, 4:03pm UTC](https://discourse.itk.org/t/compile-time-is-very-long-how-to-optimize/5196 "2022-07-26T16:03:43Z")

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I am using cmake and make to build and compile C++ code on a linux interface. Each time I want to modify the code and recompile (i.e., make), it takes about 20 minutes to recompile using make. Does anyone know why this w…

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## [How to write implement Hello World from examples](https://discourse.itk.org/t/how-to-write-implement-hello-world-from-examples/5152)

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**Author:** [@gmm9uf](https://discourse.itk.org/u/gmm9uf)\
**Replies:** 1\
**Last updated:** [July 4, 2022, 12:46pm UTC](https://discourse.itk.org/t/how-to-write-implement-hello-world-from-examples/5152 "2022-07-04T12:46:48Z")

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Hello! I am a bit confused about when and where to be configuring and compiling ITK. I was under the impression that after compiling ITK once, I can then write my own separate code that utilizes ITK’s class structure, an…

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## [While building the code I'm getting this error undefined reference to \`vtable for itk::ImageFileReaderException'](https://discourse.itk.org/t/while-building-the-code-im-getting-this-error-undefined-reference-to-vtable-for-itk-imagefilereaderexception/4679)

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**Author:** [@priyanka](https://discourse.itk.org/u/priyanka)\
**Replies:** 4\
**Last updated:** [December 20, 2021, 1:45pm UTC](https://discourse.itk.org/t/while-building-the-code-im-getting-this-error-undefined-reference-to-vtable-for-itk-imagefilereaderexception/4679 "2021-12-20T13:45:19Z")

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‘’’ libexample-postgresql-lib.a(UserService.cpp.o): In function itk::ImageFileReaderException::ImageFileReaderException(char const\*, unsigned int, char const\*, char const\*)': UserService.cpp:(.text.\_ZN3itk24ImageFileRea…