tree 9194eaed268aa4c973c3ac1ae00928fbf266462c
parent 9282edfaa0ad24be16f5e395f346ca477050cdf6
author Tom Fogal <tfogal@alumni.unh.edu> 1255456534 -0700
committer Brian Paul <brianp@vmware.com> 1255472529 -0600

Fix build when PROGRAM_DIRS is empty.

SUBDIRS just takes PROGRAM_DIRS value.  If PROGRAM_DIRS gets set
to the empty string (as can happen when building only OSMesa), a
'for' loop will lack anything to iterate over, causing a parse
error.

This fixes the issue by making sure SUBDIRS is the null string
when PROGRAM_DIRS is, and wrapping the for loops in if's, causing
them only to execute if there are directories to iterate over.