# Make can't find header nor namespaces **URL:** \ **Category:** Library Questions\ **Created:** [February 24, 2023, 2:05pm UTC](https://openfhe.discourse.group/t/make-cant-find-header-nor-namespaces/384 "2023-02-24T14:05:04Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Bernardo\_Ramalho](https://yyz1.discourse-cdn.com/flex031/user_avatar/openfhe.discourse.group/bernardo_ramalho/32/92_2.png) [@Bernardo\_Ramalho](https://openfhe.discourse.group/u/Bernardo_Ramalho)\ **Post date:** [February 24, 2023, 2:05pm UTC](https://openfhe.discourse.group/t/make-cant-find-header-nor-namespaces/384/1 "2023-02-24T14:05:05Z")
Hello, I’m using OpenFHE in a google cloud Ubuntu VM (using Ubuntu, 22.04 LTS Pro Server, amd64 jammy pro). I’m having a problem trying to run my project with openFHE. I’m following the [“Build User Applications”](https://openfhe-development.readthedocs.io/en/latest/sphinx_rsts/intro/building_user_applications.html) section in the documentation, but when I run “make” (in step 8) the compiler can’t find the “openfhe.h” file nor the “lbcrypto” namespace. I think it is probably due me not installing OpenFHE in the correct directory. My question is if I’m supposed to specify my project folder when running “make install” in step 6 of “[Installing OpenFHE on Linux](https://openfhe-development.readthedocs.io/en/latest/sphinx_rsts/intro/installation/linux.html)”. I only ran “make install” when I did it. My project has one file, which has the code I copied from _“openfhe-development/src/pke/exampls/simple-integers.cpp”_. Thanks in advance 😃 ---
**Author:** ![iquah](https://yyz1.discourse-cdn.com/flex031/user_avatar/openfhe.discourse.group/iquah/32/8_2.png) [@iquah](https://openfhe.discourse.group/u/iquah)\ **Post date:** [February 24, 2023, 3:13pm UTC](https://openfhe.discourse.group/t/make-cant-find-header-nor-namespaces/384/2 "2023-02-24T15:13:13Z")
> My question is if I’m supposed to specify my project folder when running “make install” in step 6 of “[Installing OpenFHE on Linux](https://openfhe-development.readthedocs.io/en/latest/sphinx_rsts/intro/installation/linux.html)”. I only ran “make install” when I did it. Did you specify a custom path when running `cmake` like in the following `cmake -DCMAKE_INSTALL_PREFIX=/your/path` ? * * * To make debugging this easier can you post a step-by-step of what commands you ran? e.g. ```auto mkdir build && cd build .... # Your instructions below ``` Thanks! ---
**Author:** ![Bernardo\_Ramalho](https://yyz1.discourse-cdn.com/flex031/user_avatar/openfhe.discourse.group/bernardo_ramalho/32/92_2.png) [@Bernardo\_Ramalho](https://openfhe.discourse.group/u/Bernardo_Ramalho)\ **Post date:** [February 24, 2023, 3:56pm UTC](https://openfhe.discourse.group/t/make-cant-find-header-nor-namespaces/384/3 "2023-02-24T15:56:19Z")
> [@iquah](#): > > Did you specify a custom path when running `cmake` like in the following `cmake -DCMAKE_INSTALL_PREFIX=/your/path` ? No, I didn’t specify anything. I just ran `cmake ..`. > [@iquah](#): > > To make debugging this easier can you post a step-by-step of what commands you ran? e.g. After going through everything in the “Installing OpenFHE on Linux”, I ran every step in the “Building User Application” section. I created a folder for my project and copied the “_CMakeLists.User.txt_” into the folder and switched the name to “_CMakeLists.txt_”. I then created a .cpp file with this command `touch openfhe-test.cpp`. I then copied the content of the “_openfhe-development/src/pke/exampls/simple-integers.cpp_” file into it. I opened the “_CMakeLists.txt_” file via `cat` and added to it `add_executable( fhe-demo openfhe-test.cpp)`. I then did `mkdir build && cd build` and finally I did `cmake ..`. When I then tried to run `make`, all error appeared. I hope this helped! ---
**Author:** ![iquah](https://yyz1.discourse-cdn.com/flex031/user_avatar/openfhe.discourse.group/iquah/32/8_2.png) [@iquah](https://openfhe.discourse.group/u/iquah)\ **Post date:** [February 24, 2023, 3:59pm UTC](https://openfhe.discourse.group/t/make-cant-find-header-nor-namespaces/384/4 "2023-02-24T15:59:52Z")
> I created a folder for my project and copied the “_CMakeLists.User.txt_” into the folder and switched the name to “_CMakeLists.txt_”. I then created a .cpp file with this command `touch openfhe-test.cpp`. I then copied the content of the “_openfhe-development/src/pke/exampls/simple-integers.cpp_” file into it. > I opened the “_CMakeLists.txt_” file via `cat` and added to it `add_executable( fhe-demo openfhe-test.cpp)`. I then did `mkdir build && cd build` and finally I did `cmake ..`. When I then tried to run `make`, all error appeared. I meant with regards to OpenFHE. I just want to establish that you’ve actually got OpenFHE installed in a way that your applications can find it. So you didn’t specify an install location. Did you install OpenFHE with `sudo make install`? You ran ```auto mkdir build && cd build cmake .. make # or make -j X to use more cores make install ``` ? ---
**Author:** ![Bernardo\_Ramalho](https://yyz1.discourse-cdn.com/flex031/user_avatar/openfhe.discourse.group/bernardo_ramalho/32/92_2.png) [@Bernardo\_Ramalho](https://openfhe.discourse.group/u/Bernardo_Ramalho)\ **Post date:** [February 24, 2023, 6:38pm UTC](https://openfhe.discourse.group/t/make-cant-find-header-nor-namespaces/384/5 "2023-02-24T18:38:00Z")
> [@iquah](#): > > So you didn’t specify an install location. Did you install OpenFHE with `sudo make install`? You ran > > ```auto > mkdir build && cd build > cmake .. > make # or make -j X to use more cores > make install > > ``` > > ? Yes, exactly. I then ran `make testall` with no errors. ---
**Author:** ![iquah](https://yyz1.discourse-cdn.com/flex031/user_avatar/openfhe.discourse.group/iquah/32/8_2.png) [@iquah](https://openfhe.discourse.group/u/iquah)\ **Post date:** [February 24, 2023, 7:12pm UTC](https://openfhe.discourse.group/t/make-cant-find-header-nor-namespaces/384/6 "2023-02-24T19:12:14Z")
Well, that doesn’t really make sense to me then 😕 I think that the `cmake ..` defaults to installing the package in `/usr` space, which means you hsould have needed `sudo make install`, not `make install`. If you try `sudo make install` and try to build your application does it work? ---
**Author:** ![Bernardo\_Ramalho](https://yyz1.discourse-cdn.com/flex031/user_avatar/openfhe.discourse.group/bernardo_ramalho/32/92_2.png) [@Bernardo\_Ramalho](https://openfhe.discourse.group/u/Bernardo_Ramalho)\ **Post date:** [February 27, 2023, 10:55am UTC](https://openfhe.discourse.group/t/make-cant-find-header-nor-namespaces/384/7 "2023-02-27T10:55:26Z")
So I reinstalled today and when I ran my program it worked 🤷‍♂️ . I think it was me not running `sudo make install`. Thanks a lot 😃