A JPRT windows job shows:

>>>Recursively making installerdll clean @ Wed Jan 23 07:22:14 PST 2013 ...
INFO: ENABLE_FULL_DEBUG_SYMBOLS=1
INFO: ZIP_DEBUGINFO_FILES=1
make[2]: Entering directory `/cygdrive/c/jprt/T/P1/012241.daholme/s/install/make/installerdll'
cd installerdll/src; C:/jprt/products/P1/gnumake3.81/cygwin/bin/make clean RELEASE="1.8.0-internal" FULL_VERSION="1.8.0-internal-201301230122.daholme.profiles-staging-b00" \
|| exit 1; cd ../..
INFO: ENABLE_FULL_DEBUG_SYMBOLS=1
INFO: ZIP_DEBUGINFO_FILES=1
make[3]: Entering directory `/cygdrive/c/jprt/T/P1/012241.daholme/s/install/make/installerdll/installerdll/src'
C:/jprt/products/P1/gnumake3.81/cygwin/bin/make bin BUILD_ARG=2
INFO: ENABLE_FULL_DEBUG_SYMBOLS=1
INFO: ZIP_DEBUGINFO_FILES=1
make[4]: Entering directory `/cygdrive/c/jprt/T/P1/012241.daholme/s/install/make/installerdll/installerdll/src'
SRC_DIR is C:/jprt/T/P1/012241.daholme/s/install/make/installerdll/installerdll/src
/bin/sh build_solution.sh 1 2
+ set -e
+ ALT_OUTPUT_DIR=
+ source C:/jprt/T/P1/012241.daholme/s/install/make/installerdll/installerdll/src/installer.inc
++ '[' -n 1 ']'
++ OUTPUT_DIR=
++ mkdir -p
mkdir: missing operand
Try `mkdir --help' for more information.
make[4]: *** [bin] Error 1
make[4]: Leaving directory `/cygdrive/c/jprt/T/P1/012241.daholme/s/install/make/installerdll/installerdll/src'
make[3]: *** [clean] Error 2
make[3]: Leaving directory `/cygdrive/c/jprt/T/P1/012241.daholme/s/install/make/installerdll/installerdll/src'
make[2]: *** [clobber] Error make[2]: Leaving directory `/cygdrive/c/jprt/T/P1/012241.daholme/s/install/make/installerdll'
1
make[1]: *** [install-clobber] Error 1make[1]: Leaving directory `/cygdrive/c/jprt/T/P1/012241.daholme/s/install/make'

make: *** [install-clobber] Error 2