GCC 8.3.0 detected
Compiling 3rdparty/bgfx/3rdparty/dear-imgui/imgui.cpp...
In file included from ../../../../../3rdparty/bgfx/3rdparty/dear-imgui/widgets/file_list.inl:1,
                 from ../../../../../3rdparty/bgfx/3rdparty/dear-imgui/imgui_user.inl:77,
                 from ../../../../../3rdparty/bgfx/3rdparty/dear-imgui/imgui.cpp:9093:
../../../../../3rdparty/bx/include/bx/bx.h:9:10: fatal error: alloca.h: No such file or directory
 #include  // alloca
          ^~~~~~~~~~
compilation terminated.
make[2]: *** [bgfx.make:431: ../../../../linux_gcc/obj/x64/Release/3rdparty/bgfx/3rdparty/dear-imgui/imgui.o] Error 1
make[1]: *** [Makefile:73: bgfx] Error 2
make: *** [makefile:1293: linux_x64] Error 2

find . -name alloca.h
./3rdparty/bx/include/compat/msvc/alloca.h
./3rdparty/bx/include/compat/mingw/alloca.h
./3rdparty/bx/include/compat/freebsd/alloca.h
./3rdparty/compat/mingw/alloca.h