when running icupkg from the genrb make file on cygwin, uprv_mkdir gives an error code 4
Code where error is printed is in icu4c/source/tools/toolutil/package.cpp: makeFullFilenameAndDirs
error looks like this:
INFO: {Command: /cygdrive/c/icu4c/source/tools/genrb/../../../source/bin/icupkg
-tb /cygdrive/c/icu4c/source/tools/genrb/../../../source/data/out/build/icudt40l
/*.*}
Command: /cygdrive/c/icu4c/source/tools/genrb/../../../source/bin/icupkg -tb /cy
gdrive/c/icu4c/source/tools/genrb/../../../source/data/out/build/icudt40l/af.res
/cygdrive/c/icu4c/source/tools/genrb/temp/com/ibm/icu/impl/data/icudt40b/af.res
..
icupkg: unable to create tree directory "/cygdrive/c"
ERROR: Execution of Command: /cygdrive/c/icu4c/source/tools/genrb/../../../sourc
e/bin/icupkg -tb /cygdrive/c/icu4c/source/tools/genrb/../../../source/data/out/b
uild/icudt40l/af.res /cygdrive/c/icu4c/source/tools/genrb/temp/com/ibm/icu/impl/
data/icudt40b/af.res.. returned (4)
make: *** [build-icu4j] Error 1