config.mk: improve feature test check
authorHiltjo Posthuma <hiltjo@codemadness.org>
Sun, 27 Sep 2015 20:38:14 +0000 (22:38 +0200)
committerHiltjo Posthuma <hiltjo@codemadness.org>
Sun, 27 Sep 2015 20:38:14 +0000 (22:38 +0200)
this fixes a crash on NetBSD because it requires -D_XOPEN_SOURCE (strdup, usleep).

thanks k0ga and stateless for reporting and fixing this issue!


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