https://issues.dlang.org/show_bug.cgi?id=14279

          Issue ID: 14279
           Summary: [REG:git-head]Failed to make dmd because of idgen :
                    HOST_DC missing
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: regression
          Priority: P1
         Component: DMD
          Assignee: nobody@puremagic.com
          Reporter: jiki@red.email.ne.jp

make -f win32.mak release

This command failed with:

  run idgen
  Error: 'run' not found

It should be:

  dmd -run idgen

The cause is HOST_DC variable was added, but it is empty. If environment variable HOST_DC is defined, we can make.

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