1.21.12

Enhancements:

• Whitelist the CPU_COUNT environment variable. #1149
• Add tool for examining prefix length in existing packages #1195
• Add a conda interface layer for better compatibility with conda 4.2 #1200 #1203 #1206
• Document how to run tests #1205
• Update default versions for R (3.3.1) and Perl (5.20.3) builds #1220

Bug fixes:

• Don't compile .py files in executable locations. Compile one at a time. #1186
• Don't force download if vcs is used as a source #1212
• Break hardlinks as a post-install step. Hard links can cause problems at package install time. #1215
• Make environment variables used by conda in environment creation always be bytestrings #1216 #1219

Contributors:

• @jakirkham
• @kalefranz
• @msarahan