[Gimp-developer] The problem of compile gimp

["????????" <lipingkang1999 foxmail com>]

Hello??
      Recently, I was learning to compile gimp from source code, and I encountered a problem. 
I'm following the rules https://wiki.gimp.org/wiki/Hacking:Building To compile GIMP.
      My problem is that I successfully carried out these commands:
            cd babl
            meson _build \
                --prefix=${GIMP_PREFIX} \
                --buildtype=release \
                -Db_lto=true
           cd _build
           ninja
           ninja install

      But when I built gegl and gimp, ubuntu said I didn't find babl??I hope you can help me. 
Thank you??
      My operating system is Ubuntu 19.10