../hw/per/psp/pc/psp_tmr.c:13:21: fatal error: pthread.h: No such file or directory about lv_port_pc_eclipse HOT 3 CLOSED

It seems you are using windows. In this case you need to use pthread.dll too.
http://sourceware.org/pthreads-win32/

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I tried it on Windows again and need to do the following steps:

1. Download pthread from here: ftp://sourceware.org/pub/pthreads-win32/pthreads-w32-2-9-1-release.zip
2. Copy Pre-built.2/include/ content to C:/MinGW/include
3. Copy Pre-built.2/lib/x64/ content to C:/MinGW/lib (If you have a 64 machine)
4. Copy Pre-built.2/dll/x64/ content to {eclipse_worksapce}/lv_pc/Debug/
5. I got an error: 'struct timespec' redefined. To solve this: Project properties -> C/C++ Build -> Settings -> GCC C++ Compiler -> Miscellaneous -> Others flag and add -DHAVE_STRUCT_TIMESPEC (it could be a pthread issue)
6. Download the development libraries of SDL from https://www.libsdl.org/download-2.0.php here Development Libraries: SDL2-devel-2.0.5-mingw.tar.gz
   To get it work I need to use the i686 (32 bit) libraries even on 64 bit system. So if you get undefined reference to SDL_init() error try the x86_64_w64_mingw folder
7. Copy i686-w64-mingw32/include/SDL2 folder to C:/MinGW/include
8. Copy i686-w64-mingw32/lib/ content to C:/MinGW/lib
9. Copy i686-w64-mingw32/bin/SDL2.dll content to {eclipse_worksapce}/lv_pc/Debug/

Does it working now?

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In v5.0.0 pthread is already not used. More info

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