tlbuild: --disable-all-pkgs

 
 7.2.2 '--disable-all-pkgs'
 --------------------------
 
 Do not build any program modules by default--only those explicitly
 enabled.  This is useful when one wants to work on only a single
 program, which is specified with an additional '--enable' option, e.g.,
 '--enable-dvipdfm-x'.  It's still simplest to check out and configure
 the whole source tree, but at least only the program you are interested
 in, and its dependencies, are built.  ⇒Build one package.
 
    Without this option, all modules are built except those that are
 explicitly disabled or specify 'disable' in their 'ac/withenable.ac'
 fragment.