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-rw-r--r--mk/xopen-4.vars3
1 files changed, 3 insertions, 0 deletions
diff --git a/mk/xopen-4.vars b/mk/xopen-4.vars
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--- /dev/null
+++ b/mk/xopen-4.vars
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+.POSIX:
+
+CC=c89 -D_XOPEN_SOURCE