There's a strange error when I use umk to build theide.
At link time, at the end of the wall build process, it fails saying:

...
Linking...
clang-9: error: unsupported option '--libs'
clang-9: error: unsupported option '--libs'
...
clang-9: error: no such file or directory: '`pkg-config'
clang-9: error: no such file or directory: 'freetype2`'
clang-9: error: no such file or directory: '`pkg-config'
clang-9: error: no such file or directory: 'x11`'
clang-9: error: no such file or directory: '`pkg-config'
clang-9: error: no such file or directory: 'fontconfig`'
...

My command line (fresh build umk rev 14364):

./umk uppsrc ide CLANG -rbs ./theide