[plt-dev] collection not found: #<path:racket/private/lang>

I just cloned the plt tree and get the following error when trying to
build the thing:

[...]
Compiling xform support...
standard-module-name-resolver: collection not found: #<path:racket/private/lang> in any of: (#<path:/home/meunier/lang/plt/src/build/racket/gc2/xform-collects>)

 === context ===
standard-module-name-resolver
/home/meunier/lang/plt/collects/compiler/cm.ss:236:23
/home/meunier/lang/plt/collects/syntax/modcode.ss:42:8
/home/meunier/lang/plt/collects/compiler/cm.ss:340:2: do-check
/home/meunier/lang/plt/collects/compiler/cm.ss:415:4: compilation-manager-load-handler
standard-module-name-resolver
/home/meunier/lang/plt/collects/compiler/cm.ss:191:0: compile-zo*
/home/meunier/lang/plt/collects/compiler/cm.ss:340:2: do-check
/home/meunier/lang/plt/collects/compiler/cm.ss:415:4: compilation-manager-load-handler
standard-module-name-resolver
/home/meunier/lang/plt/src/racket/gc2/xform.ss:94:24
/home/meunier/lang/plt/src/racket/gc2/xform.ss: [running body]

*** Error code 1

Stop in /home/meunier/lang/plt/src/build/racket/gc2 (line 153 of Makefile).
*** Error code 1

Stop in /home/meunier/lang/plt/src/build/racket/gc2 (line 127 of Makefile).
*** Error code 1

Stop in /home/meunier/lang/plt/src/build/racket (line 72 of Makefile).
*** Error code 1

Stop in /home/meunier/lang/plt/src/build (line 32 of Makefile).
*** Error code 1

Stop in /home/meunier/lang/plt/src/build (line 52 of Makefile).

Philippe