[install]
address=http://zlib.net/zlib-1.2.8.tar.xz
flags=--prefix=$INSTALLDIR
build_out_of_sources=false
check={prefix}/lib/libz.so.1.2.8

[install]
env_requires=INSTALLDIR
address=http://zlib.net/zlib-1.2.8.tar.xz
flags=--prefix=$INSTALLDIR
build_out_of_sources=false
check={prefix}/lib/libz.so.1.2.8

Add missing explicit dependency on environment variable.
Add missing explicit dependency on environment variable.
